<too replaced the PITA clips with #8x3/4" stainless sheet metal
screws.  Just one in each flap through the fender lip. Had to when I
gave the front passenger>

From what I've read, it looks like I did the right thing by buying  mine from Bus Depot's sale a few weeks ago, mine were missing the hardware. I also used stainless steel screws, but once they were mounted I took them back off and painted the holes I drilled then reinstalled the mud flaps with a gob of black sealant around each hole, in hopes of keeping out any moisture and preventing any rust from starting.    Jeff