whats the difference? they seems to be somewhat simliar in price..

urethane is what stock parts are made from, much stronger but heavier

fiberglass is cheaper/thinner some times and prone to crack but its also lighter a bit

urethane is the best for body kits IMO, I dont like fiberglass at all, you will be pissed when you hit that first bump and destroy/crack the fiberglass one

one big advantage of fiberglass: you can mod it for custom lights, etc. its also easy to repair for when you eventually crack it.;)


edit: just found this:

http://www.2gnt.com/cgi-bin/dcforum/dcboard.cgi?az=show_thread&om=63&forum=DCForumID36&viewmode=all

the 1st owner of my car tried to fix the urethane(stock)front w/ fiberglass and he couldn't so it's not unbreakable it but on the other hand go to your car and press the front or rear a little it'll move if you do it w' fiberglass it won't you can even break it
i would say if you get urethane ,wing west or stillen( front only) expensive 450-500 but i heard they both fit really well
my 2 cents

Urethane is somewhat better because it's pretty flexible.