This has the standard 6 bolt SB Ford #302305 backing plate.This is 26 fine spline. This will probably need new discs but was working fine when cycled out. It has wear on the pressure plate fingers too.
QuarterMaster Pro 3 Disc 5.5" Triple Disc Clutch 26 Spline & Chevy Backing Plate
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QUARTERMASTER 3 DISC PRO SERIES GEAR DRIVE MINI-CLUTCH,SBC,1 5/32",395-17090
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Quartermaster 7 1/4 Super Pro Double Disc Complete With Flywheel 153t 26spl 250