On eBay but you need to change the wiring as it won't use the stock connector.

150 AMP Mercedes Alternator W116 W123 W115 W114 W111 107 High Output Generator

US $198.49 + $20 shipping.

The claim is that it would be compatible with my 84 300D. However some of our members have said one of the AC hoses is close to the back of the Alternator. I don't know if all of the W123s have the same AC hose routing.

Note this is in the Ad: "Please let us know if you need a Single V Pulley or Double V Pulley."

Anyway 2 expensive for me.

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84 300D, 82 Volvo 244Gl Diesel