Tunnel protector install?

[WINDER1987]

Hey guys I'm getting ready to Install the tube style tunnel. Protectors on my 13 xtx. I got the 3/16 aluminum rivets today. I will be using 1.450 trigger studs with Angeled backers and a full Excell exhaust. Does anyone have any pictures or advice on installing these? Or should I add some material to the bottom of. Thr tubes for more clearance before it's installed?
Thanks.