Even if you go with the Bolt-in connectors and not the weld-ins.You'll be happy you did,And wounder why you had not done it before.If you end up flexing the body to much you may not get the doors to open OR close. You can also make your own from 2x2 box and some angel. Not hard to make and you may? save a few bucks over buying premade.
Larry/Twisted6 [oooooo] Adding CFM adds boost God doesn't like ugly.