The COE (5000 series) use the same style of shackles at the rear as the conventional cabs, and the bolts you found near the kick panels. The shackles are shown in the Factory Assembly Manual (Section 1, Sheet 3.16) They differ from the conventional cabs in that the frame side brackets are mounted to the subframe horizontally as opposed to vertically on the frame for conventional cabs.
It sounds like someone has already unbolted the shackles at the rear.


Kevin
1951 Chevy 3100 work truck
Follow this saga in Project Journal
Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.