I had too much rust , i hacked off the whole rear 3 ft on the complete frame, from the last gusset back to the bumper. the u channel i am looking for is the one that goes between the outer skin and the inner. it's the alum. one that bolts to the top of floor. The problem is the alum. u channel has a slight angle to conform to both the skins. I could make one out of steel but dont want to mix the 2 metals.
Does anyone know if regular pop rivits are used on the bottom of the rear skin or olimpic. ITs the part behind the lower alum. band.
When i figure out how to use my camera ill post some pix