I don't know measurements but I did have 2 taiwan made bars I tried to fit and they both were too long, I then found out scott drake started making their own bars not too long ago, I bought one of theirs and it dropped right in and fit perfectly, was even a tad short, and I believe they are USA made. Are you jacking the car up at the engine crossmember under the oil pan? that is the best place. Chances are your bar is just a piece of crap, go to cjponyparts.com, they have scott drake bars, but it seems only in stainless and satin. Mustang depot: Monte Carlo Bars has SD bars too.