Originally Posted by
PatrickGSR94
boooo the long ones are out of stock.

The flaps Riv sells are for the P45 (45 mm) SKS fenders; they wouldn't have fitted properly on your wider P65s.
It's too bad that you didn't get the longer flaps with your "longboard" fenders. I ordered a pair of "longboard" P65s last year that did include the longer flaps, in the proper 65 mm width.
I think you'll have to get a hold of SKS, or at least their US distributor.