As you've already found, the parts are reasonably priced and easy to get. They are not difficult to change.

However MB offers two parts, just the perches, and then a more extensive repair panel. Make sure you do not have substantial rust to the wheel well before you weld fresh perches to a rusty panel. On most of the ones I've seen done it was just the perches, but I have seen the whole panel done a couple of times.

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