remove seats, put grade 8 bolts n washers in hole towards front of truck....install pucks on oem studs and finger tighten....put seats in on new bolts....tighten them all down..very easy
call them up and ask for the silvy relocating brackets....they make em in 2 and 3"....paid like $60 but price went up. Id just try to find some crap flat stock in thickness of ur choice and use that...would be cheaper. I paid for the convenience cuz lazy
mine are 3" iirc. seats fold fwd if front seats aren't too far back....once u fold fwd, u can slide the front seats back some but not a whole lot. I wouldn't go 3" if u constantly have big people back there. My fam in sub 5'5" and they hardly ever sit back there so it wasn't a big deal to go 3".