Good deal.
I don't know if ASB makes two sizes or not but the one I have went on the S1 as it was too big for the S2.
The rear isolators bite even with the removeable sideplates; if you need a hand bring it over and we'll wrassle it into submission.
I stuck an S3 motor/cast swing arm/exhaust, etc. into my S2 and it took a weekend of steady plugging away at it. I really need to get the Purple Nurple back on the road, that's a wonderful motorcycle.
That's a pretty S1 but I can see a few updates that could stand to be done...
Keep the shiny side up!