Looks more like a dog to me.
i am no ST1100 expert (as I have ST1300) but... is that the bolt that supports the rear shock?
KIMBA the Guard Dog
Hang on and I shall FUEL up and DASH out to the shed in my SPEEDOs and see if I can grab a clue that my INDICATE to me the part posted....the TEMPERATURE is a little fresh tonight, and its dark so I will take the torch with the HI BEAM.No, couldn't find anything so I will have to pass
Rear shot 0f a ST1300 Dashboard ie speedo, tacho gauges etc.
That's a dangerous looking guard dog you have there I imagine a burglar could trip over him and cause themselves all manner of horrific injuries......