Energy Suspension body mount set issues

[72c10suburban]

I bought the Energy Suspension body mount set. From the cowl back, all was good. The core support bushings seem to be for the 67-68 models. All they included were 4 flat pieces of rubber and the instructions say to reuse the original washers with these. I called them and told them about the issue and their first solution was to pack it all back up and send it back witch is not an option since the body is bolted to the frame. Finally after a brief argument and them making some excuses about big blocks and 4x4s, they agreed to send me the core support bushings for a 72 truck.

Correct me if I'm wrong, but 67-68 trucks used 1 style and 69-72 used another and the suburbans followed suit as well?