Ford 5000 RDS E.O.N. code missing for second hand Fiesta

Hi,
I bought a second hand Ford Fiesta with a radio 5000 RDS E.O.N., but the former owner did not give the code to the vendor.
Now I had to disconnect the battery for maintenance, and I cannot use anymore my radio without the code.
The S/N is M008198, P/N 97AP-18K876-NA
Someone here is able to tell me the code???
Thanks a lot in advance!
Giovanni

0511

Thanks a lot! It worked!
Is there an algorithm to calculate it from the S/N? Or are there lists?
Giovanni