I too, have tried to put the U.S. Tool connectors on my 70 Challenger convertible (with mint factory floor pans), and had the same problems. Not even close!!! I spent about 20 hrs trying to make them fit, and finally cut them up and threw them away!! I have just ordered XV Motorsports' connectors, but they are on backorder right now. Should ship sometime next week? I'll let you know if they fit any better. They list a separate part number for 70 Challengers, unlike U.S. that only lists one number.