what i mean is the foam mock up of the housing, i'm going to use the covers that cover openings to access the bulbs from the original BMW headlights, so i need to make the mock up have basically the samething incorerated in it. I just need to know if i have to make the mock up just a little smaller than the finial product, or if i make it the real size will it work anyway...
I know.... a bit of a stupid question, but like i said i'm new to this whole fiberglass thing....