Hi Tom,
I just happen to have an old Avenger "GT 12" manual (2nd edition) and found the following part numbers for the hinges in the parts list:
RH top - c5az-6222810-c
RH bottom - c5az-6222800-b
LH top - c5az-6222811-c
LH bottom - c5az-6222801-b
Then in a "supplement" in the back of the book shows the following for the GT-12B "new door design" and uses hinged from a 1965 mustang with the following part numbers:
c5zz-6522800-b
c5zz-6522801-b
c5zz-6522810-b
c5zz-6522811-b
By the way, I have absolutely no use for this manual (was given to me by a friend who once owned one when I started building my DRB) - - - so, if you are interested in having this thing, let me know & I'll send it up to you (I'm in Northern Ca. in the Santa Rosa area).
Just let me know.
Dave