I did a lot of research on this and it appeared the mounts were either BCB or Tumblin with BCB edging out. I’m just waiting on my frame and body to come back from the shop to have first had knowledge, but I went with BCB. Jason is super helpful and has taken the time to answer everyone of my questions. It seems on the forum if you’re doing A/C, BCB clears most frames. Mines a 73 so I don’t have that extra bracing with the cross member. We shall see, but with the revamp Jason has done with BCB I have support if something doesn’t fit.