Industrial Chassis, Phoenix AZ - www.industrialchassisinc.com/ There have been some threads about it on here I think.. might try searching.
You're testing my memory......... something like "Underbody" made a two piece frame rail that the crossmember served as a jig. Bolt it together & weld the front & back half. I think Shadow Rods might have the setup now.
Yeah precision underbody. I bought 2 a lot of years back, was a good X member setup. They worked well especially for shipping to Australia.Don't think the shadow rods ones have the X member and bolt together setup as a kit?