2 bolt M/C ?

I did this on my 68 cuda with an AR adaptor plate. Originally used a MC that I bought from Auto Zone. had them bring out every one they had in stock. I was looking for the counterbore in the back of the piston to retain the manual pushrod. Can't remember what car it was originally for but it had a 1-1/8" diameter bore. I didn't like the feel as it was a very hard pedal w/o power boost. If I wasn't paying attention the car would sometimes creep forward at a traffic light.

One thing to look for is if the reservoir mounts on an angle. I think maybe the truck ones may have that angled reservoir. The one I bought came w/o a reservoir. Luckily I had a junk one with a level reservoir that directly swapped on.

Within a year I found a used original Direct Connection aluminum MC that I bought from a racer. This one has a 1-1/32" bore. Much better feel for me, but for my money, the 7/8" bore as used on the 73-76 Power brake cars gives the best feel run manually.