There are only 2 locations for the frame mounts. They are labeled "6" and "8". Now that you have the crossmemeber cleaned up, it should be visible.
------------------
Chris Lucas
1973 Chevy C-10
1975 Chevy Silverado
Captkaos Customs
__________________
Chris Lucas
1973 Chevy C-10
1978 GMC Jimmy (2WD) - SOLD
1987 R10 twin turbo LS
1991 R3500 SRW CrewCab
1985 K5 diesel swapped project
1989 K5 2WD conversion w/ Vette susp Project
Captkaos Customs
73-87chevytrucks.com