Thanks guys!
As mc71 said just measure the longest trim your going to wrap  which should be the door trim
Just make sure you get a bit more than needed just incase
i also did my ashtray and gear surround 

That looks very nice, I'll gone off the idea of yellow I think it'll look a bit cheap. 
I wouldn't mind your carbon fibre effect 
@jaffa but in silver simular to the r32 style, I did have a search but no luck could only find carbon effect.