Just did a search of over 1800 yards. No one near you are listing the knuckles...
Here is a partial list.
If you want, I can find and quote you a price freighted to your door...
2001 Spindle Ford Explorer Sport Trac 4X4 044137 $Call 99 miles away from your zip. Brothers Auto Parts USA-TX(San-Antonio) E-mail 1-800-926-8591
2001 Spindle Ford Explorer 040909 $65 361 miles away from your zip. McClurg Auto Parts Inc. - KOLT USA-TX(Snyder) E-mail 1-800-527-4179
2001 Spindle Ford Explorer 2D,4X4,ABS,LH G12501 $40 469 miles away from your zip. Roberts Salvage, Inc. USA-OK(Moffett) E-mail 1-800-259-0904
2001 Spindle Ford Explorer 040340 $60 471 miles away from your zip. D and D Salvage USA-OK(Clinton) Request_Quote 1-877-299-7398 Request_Insurance_Quote
2001 Spindle Ford Explorer 2 Dr (Spt), 4X4 (knu), LH- A5-026 $65 476 miles away from your zip. Cars and Parts by Tim USA-OK(Guthrie) Request_Quote 1-405-282-6852 Request_Insurance_Quote
2002 Spindle Ford Explorer SPINDLE ONLY CK0341 $Call 495 miles away from your zip. Petal Auto Parts USA-MS(Petal) E-mail 1-800-844-1227