Hi listees,
I fixed my propane mud flap several years ago and all is still well.  I
pulled the flap off the vehicle, breaking the connecting pins.  You can
get replacement connectors at the dealer.  Probably a special order.  I
separated the two halves by drilling out the rivets.  Pull apart the
pieces and use the old one as a template.  I then cut a semi truck mud
flap to the right shape and size (you can find semi mud flaps all along
the highways, just stop next time you see one, maybe even a truck stop
would have waste ones.  You could even use some other type of thick
rubbery material also).  I replaced the two halves and metal bar and
used two nuts and bolts instead of rivets and its been fixed since.  The
dealer got me the connecting pieces (not too much $$)  All has been well
for two years.  Cost <$10.   .
Have more fun.
Ken Wyatt
82 westy
slc, ut

PS My Burningman tickets came today.  I'm excited.