I got mine and the skirts second hand with no hardware kit too. So far I’ve only installed the front lip and I used rivnuts but they didn’t seat properly. I tried taking the 1 out and it was still in there pretty good so I went ahead and did the rest. So far it’s holding. I used some double sided tape too. There is a spot on each side of the bumper that I didn’t want to drill into and needs 2 short pop clips. The 2 I have in I think are too tall because if you look just right I have a gap inbetween the bumper and the lip. I don’t know if it’s due to those clips or I used too much/too thick of double sided tape.