Frame connectors US Cartool need help.

Well I just welded mine in. But I built a frame jig and got a factory chassis sheet to have all the demensions i needed to make sure the car was square. I then welded the car to the jig and made sure all measurements stayed. After that I welded them in. If you have a good frame shop around or race car fab shop they would be the ones to call. I also had to build a new front clip for the straight axle so I needed the jig. If you take the time to learn how to weld then you really could do it yourself.