Hi
There are many ways of finding out the info.
There is a Haynes Manual around that covers the 280TE Wagon that would help with the body parts
Here is the link for EPC
http://epc.startekinfo.com/epc/home.jsp
Also you could join the UK Mercedes Club. They have a link up with Germany and you get access to EPC and WIS as part of your membership, there monthly mag is also great.
If you have anymore questions don't hesitate to contact me.
Jonathan
78 450SL
79 280TE AMG
79 300TD
83 280TE
83 500SEC (Euro)
85 500SEL (Euro) Documented AMG Conversion
94 E320 Wagon