Found a difference 69 SWB Fleetside vs Step Side frame

[GlennBrittain]

This week I installed my hidden hitch, bumber and rear fuel tank on my project frame. I also reinstalled my 73-87 front x-member and started on my motor mounts. I thought something looked different on this frame than on my SWB 69 beater truck. Started measuring the bed mount holes. The donor for my project frame was a 69 GMC SWB Sepside. The back bed mount holes on the frames are not the same as the 69 Chev Fleetside frame . I will have to elongate the back holes to use the Chevy Fleetside bed I bought for my project. Since my purpose was to get all of the new holes drilled I would need before powder coating, I guess I will mount the bed also.