I have a set of none bolt on 5/16 spacers on the rear of my gen1. It got to the point that tire shops would not mount tires on them.
What I did was. I used 5/16 counter sink type screws. 3 per rotor. I drilled the spacers and counter sunk the holes, to match the srcews. I then squared the spacers to the rotors. Drilled and taped threads in the rotors. Used blue lock-tite on the threads. Then used my dremmel with a cutoff disc on the back side to cut off the excess prrotruding threads.
Now when I go to any tire shop. I dont get any flak about loose spacers.
Damn tire shops in my area are getting very picky about, denying what the customer wants. Some times when I only buy 2 tires. They want to put them on the rear. My style of driving, I blow thru rear tires. So I always want the fronts moved to the rear. Then the 2 new ones on the front.
I have also found that some tire shops lie about tire availability. So they can sell what they stock. I recently went thru this with discount tire. I went home and contacted the tire manufactor. I was told that my tire was not eliminated from there line. Discount tire made a deal to stock a different tire, specific for discount tire. Also they cost more than the ones I wanted. They road hard, slaped the pavement on every ridge line and cornered lousy.
I went back and told the manager about his lie. Gave him a contact person at cooper tire. That I want him to order what I use on my trac.
Well I guess I turned this into a soap box vent. This just happened this month. Fresh memory....