Peerless brakes question

I have been trying to find the size of the spline shaft that the brake disk is attached to.

I know the spicers have a standard keyed shaft.


I have measured and counted, it is a hair under 1/2 inch and is 36 tooth.

What kind of tranny is it ? i got a bunch of brake parts out in the shed from various models that i can look at if i know the make. If its off of a 700 series gearbox i think it is about a 5/8" or mabye a metric size

mst205 545c

Oh , i just blew up one. its still in the garage in pieces . i will go do some lookin and see what i find

36 splines, .5 inches. thats what i got using a micrometer .