Are NEW rear axles readily available for my SD from anywhere except the internet and a Mercedes dealership?

I don't mind buying an aftermarket rear axle, I can get lifetime warranty....anyone recommend any particular manufacturer?

are all 116 rear axles interchangable?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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