Speedway's 14 spline clutch discs??

Does anybody know if the 14 spline clutch discs from speedway are any different the stock (s10 & astro van) you can buy at the parts store? Other than the diameter of the disc itself. Is the center hub any thicker or thinner? They say "flathead t5 clutch disc"

I'm putting a t5 behind the 261 in my chevy truck.


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The hub is made to clear the flywheel bolts on a flathead.