I found some elbows like those but made out of Kynar and rated for 300 psi, from Grainger, for $55 to my door by next Monday. I ordered them, and I’ll go pick up some more aluminum tubing tomorrow to make some new lines out of. I have searched and searched for the same in straight fittings but nothing, which makes sense because there isn’t really any need for them. Reducers yes, elbows yes, but not the same size on both ends. That makes sense because the only reason for them would be what I’m doing.