Definitely Spoolfool's fillers if you want the best in the business......just don't bump into something with your bumper, as they are fiberglass......still, most beautiful, perfect fine specimen car part I've ever had the pleasure to lay my eyes on .......Mike is one hell of a perfectionist and it shows......
If you just have a daily driver, go with rubber fillers, as if you hit something at low speed, you won't ruin your fillers, lights, right and left fenders, headlight bezels and all that stuff.
But, if you are a very careful driver, go with Mike's.....you just can't get any better fillers ANYWHERE. They come painted black, and fit perfect! Man, I wish I were a perfectionist, but every time I try to be one, I drop the part, usually on a hard concrete floor!
Bruce '87 Grand National
PS: How's that for a plug, Mike?
Bruce,
Thanks for the plug. Your kick back check will go out in the mail tomorrow.

However, Spoolfool fillers are not sold painted. They just look like it.

That is a gloss black jel coat. They are meant to be painted. However, 80% of the people who buy these just put them on their car as is, or until they're ready to paint the whole car.
As for damage to fenders or quarter panels, do to the fillers not giving in before the steel does. So far, I know of at least five cars that have gotten into minor accidents, where the filler absorbed the impact before the body panel did. I believe that Highway Stars did an independent test on this also. In most of these cases, The filler was easily repaired with fiberglass.
Thumper,
You asked to see what my fillers should look like where they meet the header panel. Here ya go.
These fillers shown are not painted. As you can see, they are slightly greyer than my black paint. There is no reason that all cars shouldn't be able to be lined up like this.
I made a "flex point" at the corner. This should allow about a 1/8" of adjustment in either direction. If your car has been hit, or is not close to this adjustment range, simply re shim the front of the fender back into range.
I have never held one of Gbody's fillers in my hand. However, I have heard nothing but good things about their stock style fillers.
Right now, the market is FLOODED with very poor quality fillers that sell for dirt cheap. Resist this temptation. I hear the horror stories all the time.
Also, stay away from buying old used original fillers. Once you take them off a car, they will crumble with in weeks or months.
Happy spooling.
Mike Barnard