What bit?

The part number is the same for both sides of the 3dr Cosworth.
That part number is also used for the US/Canada XR4TI in grey.
There is another part number for the US/Canada panel in brown.
The UK/Europe panel for the XR4i is only listed in grey (even though I know they did light and dark grey) and the number is different again.

As far as I can tell, the parts are all physically the same and it is the colour that varies, but I don't know that for sure.