Ribs aluminum

I answered one of my own questions yesterday. I wondered what aluminum was used for the ribs in the 1967 Overlander. As it turns out, one of the ribs had the aluminum type stamped on it. It is 6061-T6. I need to order some channel to replace and complete my c channel. Mine is 1 1/2" wide and 1/2 tall and I have a hard time finding that in 6061 but it is readily available in 6063-T52. That is a very corrosion resistant but also much softer aluminum. I hope the softness will not be a problem. Over at Airforums, a lot of guys just form their own channel out of rest pieces of 2024-T3 and I think I will do the same to strengthen bits here and there. My trailer has lots of channels pieces formed from scrap pieces that way.