My General Export model came with a back light the size of a lunchbox, probably the same as the US models.
As it rubbed on the carrier I swapped it for a new 500 one I got on eBay.
The holes don’t quite line up by a couple of mm, but as it’s rubber mounted you need to look very closely to notice.
The 500 light isn’t right for the model, but I have kept the original, and it looks right.