ok....that's not my Speedmaster.... I have more taste!!!
It's a company in Mexborough UK, and they make stands for all sorts of bikes. They have one for the 'normal' Bonnie/Thruxton.
They sell them normally through eBay.. so
here's the link for the eBay page.
I didn't get it through eBay though. I bought it of Grip when he sold his SM for something else....