Another Mystery Part
This is kinda embarrassing; I've been working on cars and trucks for 50 years but I have never come across this.
I bought a CPP disc brake conversion kit and this came in the caliper box, one with each caliper:
It's a square O-ring, about 1 1/2" OD. I have no idea what this would have to do with a caliper install. 67-72 C10
Any ideas?
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