Its not so much of an easy job tbh, getting the bolts all lined up in the correct position can be fun & especially in a car roof, but iirc I think there are some premarked locations on the roof to drill the holes, would make life so much easier for installers as I install sharkfins & thats fun enough for sure, but as long as they seal up properly then should be fine, I'd like some black rails for my SB then I can sell my chrome ones.