I think you should be able to find that part at a wrecking yard. It should be replaceable, although I have not looked at the feasability of doing this repair specifically.

Doug

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1980 Mercedes 300 SD, 215,000miles
2001 F-350 Powerstroke turbodiesel, Crewcab, 4x4, 81,000 miles
1993 Chevy Suburban, 185,000 miles