Welcome to the forum :hello2:
First off I will have to level with you, you are not going to get a whole load of specific help here. The 250 is not imported into North America and that accounts for most of the membership. We do not have many European 250 owners who post here regularly (someone please tell me if I am wrong and I will apologise).
So, how to proceed.....?
All the bits you need will be available from Suzuki but there are two problems which you may have already discovered. Time and money. Inevitably stuff will be on back order and will take somewhere in the region of 8 to 12 weeks to arrive at you location. You will pay through the nose.
Fowlers of Bristol are good guys and will help you with the above.(identifying part numbers etc)
To reduce costs then it is down to salvage bikes and parts. Once you have identified part numbers for the items you require you can then check if the 400 equivalent part is the actually the same item. I would be surprised if they are.
I hope this does not put you off, that is not my intent. Fixing a single cylinder engine is no big deal - once you have the parts in your mitts. Talk to Fowlers.
