There is a tool rental program going on click on that thread I believe that 2 parsons were renting their socket.
The socket sells on Ebay for around $40 and you also have to pay shipping. 2 Ebay sellers Zdmak and El Paso tools. I also comes up for sale by private owners on Ebay.
The companies who support this site most likely also sell it also and might make a special effort to get it to you faster.

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84 300D, 82 Volvo 244Gl Diesel