Excellent advice and yes US Car Tool connectors. Prior to welding in new cross member I drilled holes to move emergency brake cable over to come out other side of frame connector. Hooked cable up verified prior to welding in cross member with frame connector held in place so all set there.
Brake and fuel lines going to be custom run up inner side of frame connectors. I verified mufflers exhaust are far away plenty of room. I have high end steel line flare and other line tools on hand from prior project.