Land Rover Discovery 1 had the same looking window mirror switch on the dash, although the position of the electrical connection on the back is different. Might be work seeing if you can find on in a scrap yard, AMR2498.
@talkingcars You mentioned in a post a few years ago that you used the cruise control steering wheel switches from a ZS to control the cruise control that you installed in your MGF. I'd like to do the same thing. Do you recall how you adapted the cruise control's wiring to connect to the ZS' steering wheel cruise control wiring?