[Bruce Lancaster]

I was just about to answer your email...brought in the hardware to scrutinize.
I have right here until my boss comes along a Model A perch and a Model 40 '33-4 perch, which is the service replacement for a '32 and dimensionally interchangeable.
Thickness need will be based more on your wishbone than axle...you will shim the axle there but bone will be same thickness for perch.
Forgings were made in many dies, and will be found to vary a bit, but holes should have same spacings.
Putting the two side by side with the line at max diameter of the cone that enters top of wishbone, the two seem to be within less than 1/32 of the same length down there...'34 the shorter but almost indistinguishable dif. Bottoms of cones also align, threads start veryvery close to same place.
Placing the two cheek-to-cheek, the shackle holes are on same center location...V8 is bigger of course.
Balls for shock absorber are pretty close to same level, V8 one extends about one inch farther over than A.
Brake linkage bolt is likely the measure you need the most...hard to compare, but I would say V8 is right about 1 3/4" higher.
Remember '32 axle is not just dropped more, brakes are 12" rather than 11.
Suiggestion: Boltittogether by using '32-4 front brakes. Same basic design as A, but not only larger, they come with excellent cast iron vented drums., like the 1931 A so-called Rocky Mountains...which are nearly unfindable.