specifications 1990 250 motorhome

[ter Braak]

I recently shipped my 250 motorhome 1990 to Holland.
To get a ( german) registration I need to know the exact specifications like wheelbase, engine specifications etc.
Supposedly there should be a metal plate indicating these specifications.
(Apart from the engine number of course)

Does anyone know where I could find this metal plate? Is ther another way to find out these specifications?

Would help a great deal!!

Gert-Jan ter Braak
Holland