Not all plastic body filler is made by Bondo® and not all plastic body filler is poor quality. It's just another tool in the body man's tool chest. Like any project you've got to have the right tool for the job and know how to properly use it to achieve satisfactory results. I like the exposed pop rivets on this car. Fiberglass and metal and plastic body filler do have different coefficients of thermal expansion. It's possible to mold steel fender flares to steel body panels using lead filler and get good results. I think that with fiberglass flares molded to metal panels the seam will always be the weakest part. It might look great for years without issue. But a poor job will show up within a very short time.
They are available for either NA or NB for $1100. With the current kits, you have to do major surgery on the rear fenders, but the entire front fenders simply get swapped with completely new fiberglass fenders:
So in the front, there's much less work (and expense) involved than in the rear which requires cutting and molding.
PM.com's BRG car in the pics above has the "old-style" (but still available) version of the NA kit where the front flares get molded to the stock fenders (or riveted, as they did) like the rear ones. This means you have the time and expense to cut back part of the front fender lips before attaching the flares. This "old" version of the kit is $975 and is only available for NAs.
Email me off-forum @ [email protected] with your shipping coordinates if you'd like a quote.
Here are some pics of my work-in-progress install on my '95: