Mine is a factory parts list for all (most?) models by year, model and system #. It's a two CD set installed to the hard drive. It gives you the factory part # and/or all supercede #s. It also has exploded views of most systems. You can get prices, compare parts by year, part #, etc. It's only thru yr. 2000 on mine. Some folks even have ISO for it posted on their FTP servers, so others can download. They are all over the place (eBay?); mine is nothing special, just very useful. I haven't seen any model specific EPC's; they cover all models because it is what the dealership uses. If you search this site http://diesel.list.mbz.org/archives/
you'll find a lot of discussion on the EPC.