SKS Fender Mudflap, LONG, each
SKS LONG fender mudflap. This is the same mudflap that is standard equipment on the P45 longboard fenders. It looks like it's hard plastic but it's actually soft pliable rubber.
Now includes a plastic screw and plastic nut instead of plastic rivet* hardware. We recommend using zip ties or a metal screw and nut instead of the plastic hardware. Hopefully SKS will go back to the sort of strange but secure plastic rivet hardware though.
*How to remove the special plastic rivet:
-Press out the metal center pin
-The silver washer should now slide off the plastic rivet
-Push out the plastic rivet
-Flap will now slide off fender
This will also work with non-Longboards (like the P45), just as long as it's a fender 42-45mm wide.
Easy to install: slip this on the end of the fender, make a mark on the fender with a sharpie where the hole in the flap is, drill about a 1/4" hole in the fender and use the special plastic rivet things to hold it on.