Best method to flush-mount widebody fenders (welded rear quarters)?

I was wondering if anyone would have recommendations on the best method for mounting a set of widebody fenders. What I have is a car that has welded-on rear quarters like most, and I bought a widebody fender set that does the complete rear quarter front door edge to tail light, and is meant to be attached directly to the quarter.

Would the best way be to drill holes for mounting, use flush-mount rivits, and then 'glass over the mounting points and edges?

Thanks in advance!
- James

Depends on the widebody. Some of them actually require a large portion of the 1/4 panel to be removed.

Nah. They go right over top of the existing ones:

http://cianciperformance.com/exterior/fenders/3000gt/
http://cianciperformance.com/exterior/fenders/3000gt/sidefrontvclose.JPG

I emailed Cianci and they said that pop-rivits sanded flush is the way they'd done before. I was just wondering what other ways there are to do it? I don't know what to google search on that, I tried "flush mount fenders" and a few other things without much success.

I wanted to avoid drilling holes into the rear quarter panel if possible, since I don't know what's behind it where ... but I don't want a cheesy installation either.

The way we do it with Porsche 944 cup cars is using 3M Adhesive, we usually didnt need to worry about smoothing out. The fiberglass usually breaks before the 3M Adhesive.

Hi james have you thought of using body panel adhesive,no rivets to grind off.Just a thought .Good luck with your project. Brad

The way we do it with Porsche 944 cup cars is using 3M Adhesive, we usually didnt need to worry about smoothing out. The fiberglass usually breaks before the 3M Adhesive.

Yeah, thats good stuff. There is also a product called Click Bond that works good. The best stuff I have used is called Plexus, its not cheep, but you wont need much. You also have to buy a special applicator for it, I think it sells for around $40 and the glue is about $10 a tube I believe, its been a while sence Ibaught it. Even epoxy laminates will delaminate before the glue comes off. If you have a marine supply place you might find it there, if not you can find it online with a little searching.