Unofficial parts search and pricing of G-Wagen parts
There are two unofficial sites providing information about availability and pricing of G-Wagen parts. Mercedes-Benz used to privide this web service for some time but abandoned it without notice.
How to use the search function.
Enter the part number you have been given or have obtained through EPC CD. A Mercedes online service (EPC Net) will also provide you with part numbers. Free for US subscribers and reasonably priced for most other countries.
Germany based parts site
Russia based parts site
USA EPC Net
even though not mentioned on the site info - all models from 1979 on are supported
Worldwide EPC Net