DIRECT CONNECTION CATALOG

Can you tell us what type of parts the numbers relate to? I have some catalogues from 71 and 72, but a little focus would help.

DC P3690007 is Dana 60 rear end 52,5" Hsg. width.
The two #,s are listed in the Guide about ยด68 SS Hemi A-Bodies.
PN2881239 Assy Rear Axle 8 3/4
PN2881246 Assy Rear Axle Dana 60
Thank you