It was originally spot welded in, and this isn't exactly heat treated high carbon tool steel we are talking about. As far as the rust issue goes, yes you will have to make sure you get paint on everything. I took the fender off to do mine, so I know I got it painted well with POR-15.

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For Sale: 1982 MB 300TD
1995 Chevrolet Suburban 6.5TD

Sold: 1980 IH Scout Traveler- Nissan SD33T Diesel