will doHi Damian
As your F4 has 2106 as the oval plate number. Your van should have originally had an 845cc engine. The engine number 688 is for the 1108cc engine. It looks like someone has changed the engine at some point. Not a bad thing, as you have more power than the original. I have a used starter motor for the 1108cc engine. If interested email me at: christianebeyer@yahoo.co.uk