Balrgn, I prefer original ...
My preference is to original, although ...
The resilient mount is small and is on the lower aft corner of the guards. I believe it has a threaded insert in the middle of the round rubber that is attached to the two leg metal strap. It should come with a round head machine bolt in the mount that goes through the rock guard.
The aft upper corners is an aluminum 'hat' in cross section is total 1 1/2" wide with a 3/4" x 3/4" hat. I guess ~ 3/32" thickness.
I saw at the dealer, apparently the resilient mount isn't used anymore, just the aluminum 'hat' section installed for top and bottom attachments on new units. The 'hat' is riveted to the skin and provided with a fixed 1/2' SS bolt. Length varies from 2" to 5".
As the guard (AS calls it a 'wrap protector') hinges closed to the rear, the bolt protrudes through a hole in the guard and a cap nut secures it.
My efforts to obtain, say 18" of a compatible/similar 'hat' extrusion has been unsucessful.
"... there is nothing you can't fix yourself ...
... if you're handy ...
... with a check book! ..."