I'm trying to track down the 4 correct bolts needed to mount my calipers to the spindle. It's a 68 year model Charger and according to MMC it should be a 9/16-13 x 3.25" large head hex bolt. I'm questioning this size due to the caliper mounting hole not not being large enough to accept a 9/16" bolt - looks more like a 1/2" would be correct size, especially when coupled with the 13 thread pattern. The 3.25" length also seems too long for this purpose. Speaking of bolt B. in this pic. Hoping someone may have their disc brake car apart to comment?? TIA

Tom