Yeah.. your factory carpet wont be wide enough to make the slope down where you welded fillers in. You can have carpet made widder than factory for just a few dollars more. Just find a supplier and let them know that u need it widder.
Mike
Just order new carpet and ask them not to trim it. People on streetsource talked about this awhile back, I think there was a place out of phonix that will sell it untrimmed.