there isn't much to add as it just fits with a sunroof car and on the hoop ends you just have to make up a 4mm plate, weld that to the floor and then weld the hoop to the plate. I haven't welded mine yet as not got round to it but it is all prepared. the alternative is to fit it with the sunroof open so it all sits where it is supposed to and then grind about 2 inches at the sides of the sun roof where it hits. If you dont want to grind a gully then it does shut enough to keep it water tight if you don't mind it not being flush with the roof but i suggest a plate. Only thing to add is take a seat out when fitting the rear as it is miles easier.