I just got a new starter for my '84 Camper and removed the old one from
the car, the odd thing is the new one is longer about 5cm and the
part that goes
into the engine looks slightly different, after putting it in I
noticed that the
new starter doesn't have a grip inside the engine and therefore
doesn't start the engine.

The engine was replaced in 1998, but I don't know if they changed the
starter.
Is there any way to adapt the new starter or a way to find out which
starter exactly is needed?

thanks

Georg;