There are no problems expected with the rubber. Some friends are driving 9,5 with 255 tyres with no problems.
Write Mekkes, He´s able to talk and write English. Don´t worry. He´s the guy for all R170 specials in Germany. Headlight and indicator are two pieces, you have to order them extra. The tyre and intercooler pope you find here:
Gerhard.Pralle@gaa-ce.Niedersachsen.de
Gerd is very nice too and he´s talking English. Send regards from Gero.
There are too many steeringwheels in the market. Search at Google and Ebay, you´ll find a lot.
www.eris-car.de is one of the shops. Carlsson.de, brabus.de, kicherer.net ...