1. If you are planning on keeping these on for a long long time, use some SEM glue or Corvette epoxy glue. Its strong as fuck and wont come off. I used the SEM glue to put 12 pieces of widebody panels on my car and that shit wont budge at all. Then if you did that, you could one sheetmetal screw in the inner fender and inner rear quarter panel just for extra strength.
2. You use screws all around, lol.
3. Get the double sided tape that factory uses with them. You can actually buy it from the satin dealer. It is super ass strong double sided tape. You could double side it all and then do the sheetmetal screws like i said above in the inner fender well and rear quarter panel inner well.
I personally would suggest #1 if your keeping them on for awhile. #3 will work goood too and the tape is strong yet will come off with some good tugs after a few hours if you ever wanted them off, lol.
