This has been bothering me as well. They are both warped on my 2003 (see attached photos). I have done a ton of research on these parts, and I was planning on posting on this subject soon, so I'll just add on to this thread. Here is everything I have on the subject.
New Old Stock
NOS of the correct color code is what I would prefer. I recently bought a NOS driver side (1L5Z-3551728-AAF) part on eBay (December 2023), but the seller cancelled the order after I made my payment, claiming that it was a "broken item". It felt like a scam, we'll see if I get my money back. I have saved searches for some of these part numbers on eBay that are turning up nothing.
A month later, a NOS passenger side (1L2Z-3551728-AAPTM) part showed up on eBay. Bought. I'm hoping to see another driver side part eventually.
There are still a few passenger side NOS parts available, but the colors available are limited. I have not identified any source for NOS driver side trim of any color. And I have spent many hours looking.
2001-2005 Ford Explorer Sport Trac
1L2Z-3551728-AAPTM - Moulding - Roof Drip Side Trim RH - Passenger Side (01/2000-06/2005) 2001-2005
Replaces:
1L5Z-3551728-AAS Redfire (08/2002-08/2003) 2003
1L5Z-3551728-AAM Aspen Green Metallic (03/2002-08/2003) 2002-2003
1L5Z-3551728-AAA Harvest Gold (01/2000-08/2003) 2001-2003
1L5Z-3551728-AAH Oxford White Solid C/C (01/2000-08/2003) 2001-2003
1L5Z-3551728-AAB 2001
1L5Z-3551728-AAP Silver Birch Metallic (03/2002-08/2003) 2002-2003
1L5Z-3551728-AAK 2001-2002
1L5Z-3551728-AAN True Blue Pearl (03/2002-08/2003) 2002-2003
1L5Z-3551728-AAD 2001-2002
1L5Z-3551728-AAC 2001-2002
1L5Z-3551728-AAE 2001-2002
1L5Z-3551728-AAL Zink Yellow (03/2002-08/2003) 2002-2003
1L5Z-3551728-AAJ Estate Green (01/2000-08/2003) 2001-2003
1L5Z-3551728-AAF Ebony Solid C/C (01/2000-08/2003) 2001-2003
1L2Z-3551729-AAPTM - Moulding - Roof Drip Side Trim LH - Driver Side (01/2000-06/2005) 2001-2005
Replaces:
1L5Z-3551729-AAS (01/2000-06/2005) 2001-2005
1L5Z-3551729-AAM Aspen Green Metallic (03/2002-08/2003) 2002-2003
1L5Z-3551729-AAA Harvest Gold (01/2000-08/2003) 2001-2003
1L5Z-3551729-AAH Oxford White Solid C/C (01/2000-08/2003) 2001-2003
1L5Z-3551729-AAB 2001
1L5Z-3551729-AAP Silver Birch Metallic (03/2002-08/2003) 2002-2003
1L5Z-3551729-AAK 2001-2002
1L5Z-3551729-AAN True Blue Pearl (03/2002-08/2003) 2002-2003
1L5Z-3551729-AAD 2001-2002
1L5Z-3551729-AAC 2001-2002
1L5Z-3551729-AAE 2001-2002
1L5Z-3551729-AAL Zink Yellow (03/2002-08/2003) 2002-2003
1L5Z-3551729-AAJ Estate Green (01/2000-08/2003) 2001-2003
1L5Z-3551729-AAF Ebony Solid C/C (01/2000-08/2003) 2001-2003
Used Parts
On Gil G's thread below, it is reported that a search of junkyards for usable trim pieces generally turned up empty, and that they all suffered from the same problem and were in worse condition than the ones on his own vehicle, unless the vehicle was covered. It is apparently the sunlight that causes the damage, they get brittle, warp, crack, and fall off eventually.
Related Threads
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Explorer Talk: Wanted: Left Roof Molding for 2004 Black Ford Explorer Sport Trac Apr 4, 2017 (Lisa)
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Sport Trac Forum: Confused about how to replace a piece for the roof. Nov 10, 2019 (Natureboy)
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Sport Trac Forum: Roof Rail Trim Nov 22, 2019 (Gil G)
Equivalent Parts
A lot of Ford pickups of the same generation had very similar trim pieces that are still available. However, I don't think there are any that are compatible, because the shape of the back of the Sport Trac cab seems to be unique among all of the Ford models. I would love it if someone could provide some evidence that disproves this assumption. I don't have enough information to know for certain.
Aftermarket Parts
There is a company that makes "upgraded" rear corner trim replacements for a lot of Ford trucks, including the Ranger. But I don't think any other model is part-compatible with the Sport Trac for these two specific trim pieces. See
eBay search. I contacted the seller but they said they don't make anything specific to the Sport Trac.
A hint from Natureboy's thread from 2019 led me to search for "sport trac roof repair kit," and this turned up another seller on eBay who makes aftermarket replacements. He states that these can be installed using adhesive, without removing anything from the interior. I can't vouch for them because I haven't tried them (yet), but here is the seller's store:
MOPAR B-BODY PARTS
Normally, I would have preferred factory parts. But since the originals were clearly designed to fail, I ordered a set as a backup, because I know it is just a matter of time before mine fall apart/off. I've attached photos of those including the installation instructions. I think these are cut from black wall base. I can't tell if they're vinyl or rubber.
Procedure
I'm attaching the relevant pages for removing the cab trim from the 2003 Sport Trac Workshop Manual. The "proper procedure" is to remove the interior roof lining and unbolt from the inside.
Update
My NOS passenger side trim (1L2Z-3551728-AAPTM) finally showed up (see attached photos). I hope to use this as a template for 3D printing "new"
passenger and driver side trim components from ABS plastic instead of polypropylene (which may be why the original pieces warp and break).