The 47-51 frames are different in that they had no wing window in those years, there are some knotches at the front to clear the wing wings. I think I have a pair of them for your truck in my spare parts. PM me and remind me to look for them. But you could simply sand blast yours and paint them if you wanted. How are they "split", unless they polished thru them on an edge or something before plating I can't see how they could "split".