Found and purchased a 1960 GMC 2503 from a local salvage yard. Got it home and started playing with it this weekend. PO had added a drop fuel tank directly behind the cab and also added a chevy LWB, that sets directly behind the tank. Farm made bumper was about 10" in depth. Removed the home made bumper and found that the PO had cut the frame off even with the rear of the chevy bed. Have tried to find the original frame length online, but with no success. Does anyone have this info, or possibly someone with one on hand, provide some dimensions? Any info would be helpful!