My first vehicle! 1956 CJ5

[bmorgil]

Sometimes you have to work with what yo have. If you can heat the bracket and "fit" it, that would be my choice. On mine I had one bad stud. I removed the old stud from the bracket and replaced it by welding in a new stud. You could repair your old bracket also and save the money on the one that doesn't fit.

[gmwillys]

You can do either that Bmorgil said. In my opinion, since you already have the new mount handy, clean the frame really well and start at one end welding the new bracket in. As you hear up the bracket during the welding, you can close up the gap with a C clamp. I'm pretty sure that's how it was done from the factory.