I can't think of anything that will fill that canyon. I know, as I'm doing the same thing. What I'm ending up doing is molding it in with the fender and headlight bucket. I'm making sure there is no rust what-so-ever in that area, then I'll be using tiger hair (fiberglass).
I've always said and still do, the stock bumpers don't offer much in the way of protection. Not when I can bend them with my hands.
I've always said and still do, the stock bumpers don't offer much in the way of protection. Not when I can bend them with my hands.