*shrug* If you already have the fenders stripped for body work and don't mind doing the fill work to fill in the holes where the side markers use to be, then go for it. If you'd rather not fill in the holes, then don't do it.
Personally, I think I'd go for it (remove them); the stock side markers have that nice tacked on after thought look to them. Or I might get fancy and make a set of flush markers.
One small note: if you DO decide to fill the holes, please use metal. Would hate to see 4 perfectly circular cracks show up from the bondo breaking free.
In a previous life, I thought I'd shave door handles off a pick-up I had. Instead of filling the depressions with a metal plate and just smooting with bondo, I filled the entire depression with fiberglass cloth and resin and then layed a 1/8" layer of bondo over it. It looked sweet when it got painted, but needless to say, it started cracking in less than a year. /ubbthreads/images/graemlins/nonod.gif Eh.... what can I say... I was young, dumb, and everyone else didn't know what they were talking about. /ubbthreads/images/graemlins/blush.gif