ARE TRANSMISSION MOUNTS ALL THE SAME?

Hi Folks

I have a '71 Demon with a 727 auto that came in a big box.........

Can anyone advise if the crossmember/trans mounts are the same for 3 spd, 4 spd, 904 and 727. Trying to get my ducks in order before I start to assemble the car.

BTW.......This is NOT the spool type mount.

Thanks