To make the exhaust for my LCA, I tried some off the shelf stacks from an Aeronca Chief, but did not like the exit point. Rather than modify it, I took Service Memo #7 off from Bill's site, took some pvc, made a mock up and sent it to Dawley Aviation, Burlington, WI. They tack welded a pair out of stainless steel, then sent to me to test fit. All was good so they finished welded it. Its as close to original as I could get. The carb heat shroud is a modified Cessna part, the cabin heat is the same, but I am not real confident the cabin heat will work with out forced air. Final length will be trimmed after cowling is fit. Its been exhausting.