Just picked up an original paint 69 C30 with 57K miles and have questions

[StingRay]

I just brought home an original paint 69 C30 cab and chassis last night. It has 57 K original on the chassis. For its age the body is quite good with minimal rust. The engine has been swapped for a newer 350 as I understand the old one siezed from sitting for many years. The rear end was swapped out to a 14 bolt as the old Eaton had been bent and that was the reason it was parked. I just noticed that the truck has no rear shocks. The chassis has no provision for upper shock mounts anywhere from what I can see and the the ones on the 14 bolt are gone and 1 at least would not have been correct anyway. The truck rides beautifully and has been this way for at least 10 years. Did the duallies not have rear shocks? If they did has anybody got a pic of the rear cross member so I know what to look for. Would one from a 73-87 work?