hatch problems

[mountainman1]

I am new to this posting "threads" so please bare with me, I have a 1970 GMC Jimmy K5 that i finally talked away from the previous owner after waiting 25 years for it. We started a year ago doing a frame off & finally have it coming down to the last 1/3. when i bought this Jimmy i had to replace the hardtop which i came across a perfect single wall for $100.00 but the rear hatch was screwed (royally), so I bought a new hatch & handle that came from BROTHERS TRUCK PARTS, after receiving it we found that the holes on the side of hatch for the striker latches were not cut out properly & the metal brackets that were riveted "around" the holes were not positioned properly before they were riveted at the factory so after 8 hours the holes are now correctly set up. the hatch was painted inside & out, then we installed the glass & new weatherstripping. we went to install the new hatch handle from BROTHERS TRUCK PARTS & found the beginning of many problems. 1st of all we found that the bracket that goes inside the hatch to retain the hatch handle would not fit into the new hatch, then we found that the hatch handle spring assm (original as new one is not available) would not fit without pushing square shaft of hatch handle off angle as it rubs against the fiberglass (the pocket where the spring assm & shaft fit into the inside of the hatch is not as deep as original door). in addition to these problems we also noticed that the new gaskets/seals provided by BROTHERS TRUCK PARTS for the hatch hinges will not fit, the new ones are fat short rectangular but the originals are long & narrow with screw holes on each end & are retained with a metal plate over the gaskets. we have contacted BROTHERS TRUCK PARTS & have received very little assistance & we do not know what to do. has anybody ran into this problem before? any suggestions?