I suspect that BOSS has these as well. I bought what he had a month or so ago, but I think he said the new stock came in right away.
FWIW, I found that 95% of the slope in my swingarm was due to the SA bolt not pulling tight enough and "squeezing" everything tight. The threads on the bolt get munged up and don't allow for proper torquing of the bolt, I ended chasing the threads with the nut and then reasembling, all slop dissappeared.