It looks very similar to the male terminal end of the fuel pump controller lead. I suspect it's a standard BuMW fitment. I do though admit that the words 'looks', 'suspect' and 'similar' are often fraught with internet induced twaddle danger.
A possible answer is to get Ocean to order one in, take it into the showroom and have a look against a bike, or yours if it is parked outside. If it's no good, stroll back to the parts department and get your money back. Look forward to the news.
I came up against the "similar" when trying to make a FPC work around cable. Plug / socket looked similar, wasn't until I had them together I noticed one was a mirror image
You could take the accessory plug off the bike for a 100% confidence check when you see the dealer.
Or, ask them if they have an accessory socket in stock for 1200 GSA to compare against