HELP NEEDED Identifying Brake Spindle - likely from a late 70s Volare

soonercruiser said

So, what brake calipers would fit a FMJ spindle???
We've tried the supposed single piston replacements, and they don't seem to fit correctly.
(I had ground those off to clear the wheel edges - had also already bought 14 inch tires!!!)

Anybody know anything about an "Optional Mounting Adapter"????

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You have them already. The single piston calipers you already have are the correct caliper for both the 73-76 A body AND the FMJ spindles. Same caliper bracket, same caliper. There were some minor differences in the calipers over the years/models, but that was bore size which has no effect on the outside clearance, and the hose location, and if your hoses clear the spindles then you have the right ones.

The problem is your wheels.

Let me repeat that. The problem IS YOUR 14" WHEELS.

As far as I know, the other aftermarket brake kits out there for those spindles also have disclaimers about some 14" wheels. So, buying an aftermarket kit may not help you do anything other than spend more money. Given what aftermarket brake kits cost, and what 15" rims and tires cost, I'd buy a set of 15" wheels and tires and sell your 14's. Even losing money on that you'd be money ahead vs buying new aftermarket brakes, ESPECIALLY if they still don't clear! Which they might not.