Finally got some sheet rubber in house, for the fender-well-cross-hole-draft-blocker project. Used .031 inch thick, BUNA N oil resistant rubber. As was suspected, the PVC stuff was too brittle in the cooler temps, but it did give a good indication how to better fit the version 2. The BUNA N has excellent temperature properties. There are two pieces for each side. The upper piece is held at the top edge with black RTV, the plastic inner fender liner, and the two piece push rivet that holds the liner in place. There is a 10mm hole in the frame that was in the right spot to hold both pieces where they overlap near the bend in the brakeline. Used a one piece push rivet there. Both pieces overlap again, and are held in place by a single piggy-back snap, on the bottom inside of the underside factory aero panels. The front most panel is also held by the existing two piece push rivets, in the factory fender liner panel.

Theory is this mod will help keep some draft out of the engine compartment, and also some slush and moisture from accumulating on the engine blanket material. Weight of the BUNA N is very minimal.