Steve, Got a 7, not an 8, I would assume they were the same, 1", but you know what they say about assuming. A buddy of mine had an 8, and it looked the same to me. Hope this helps.
Allen
Very Slow Build 7A
If you're ordering from Tosten, they ask you the aircraft model and will supply the right size bushing for your stick, which is a separate piece from the stick itself. Tosten is also really good about sending you a bushing if you purchased through a 3rd party and didn't get the bushing from them. Learned this from personal experience.