Found these listed on Speed Unlimited but have no clue if they are any good or not may be some one else here does though. C04-3645 Chassis Engineering Weld-In Subframe Connectors 1970-77 Maverick $$99.50
Don't want to step on any toes here,if I read this right Dan doesn't make them anymore,if thats the case read my thread "Ever see a Maverick pickup?How adout one tubbed?" All I use is 2x2 1/8 wall,you need about 8' to do both sides,theres cutting and welding involved but it's not that hard,check it out.