Reverse light switch

Hoping someone can help.
My reverse light has suddenly decided to give up, checked the bulb which is fine so I'm guessing it's the reverse light switch.

It's a 1994 1.0 16v but all the car spares shops are showing me something that I can't find on my gearbox, I can see what looks like a black plastic cover with a wire that goes into it and the connects on top of the gearbox. Can anyone confirm if this is the reverse switch, if so, is it likely to be main dealer as all shops so far are looking at me blank when I try to get answers from them.
 
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