I have a few matchboxs as well, one of them is a Mercury Sable Station Wagon (love it) and im not sure now if its left or right hand side, i also have a Bentley or a Rolls and a Rover Sterling, this two are right hand side, i think i have more matchbox but i dont remember right now, and besides from this scale the brand i have the most are majorette.

Anyway i have never tried to change the steering wheel, why would i? and why would you Ddey?