Axle centerline with TCI crossmember

Curious if anyone knows off the top of their head if with the TCI mustang II if I center the upper bag mounts off of the crossmember or if they need to be forward or back from it. The crossmember bolts in so it cannot be in the wrong spot, but the directions don't go into detail about location of the airbag mounts on 54 Chevys.

Anyone with experience please chime in!

Thanks and Merry Christmas!
Jaison