Depends on how much your willing to spend for the long run. I got a "Rivnut puller"( 95585A100 Each $52. 59) with a bunch of rivet nuts( 98280A410 6. 58 per box) and one quarter/twenty allen head stainless screws(92949A542 $12. 03 per Pack of 50) with fender washers and install my plastic fenders front and back with those. Then I installed my mud flaps with them. It makes it easer to take anything on and off and you can do it as often as you like without paying 1. 25 or more each time for the plastic rivets. Then there is any thing you can think of to use them on. Only the imagination limits you.
I got all these from McMaster-Carr. Page 3190, 3187, 3055. Hope this helps
WD