Clutch question for Y-block Car guys

[Ross F-1]

I have a diaphragm style clutch I bought at NAPA for my flathead truck. The clutch worked fine but the truck clutch linkage didn't seem to have the right throw for clean disengagement.

The old-timer at NAPA told me it was a Y-block clutch, but since I bought it, NAPA has stopped carrying them, so I can't confirm (and the old-timer retired).

Can any of you confirm this is what Y-block cars used? It's a 10" clutch and the bolt pattern to flywheel is same as the Long clutches on a flathead.