Thanks Doug. Just what I was looking for back when 226 preban mags were cheap, and 228s were not. Glad to know somebody fills that market niche.
FWIW, for added capacity, putting a follower from a Clinton 10-rd mag into a factory 13rd 228 mag increases the capacity to 15 rds, and fits flush. My 228 ran fine with it, but I didn't want to over-compress the spring for extended periods. I use the stock 13 round mag for carry.
I imagine dremeling off the tab on the bottom of the 13 rd follower would work as well, but I've not done it.
Neither method adds grip length, if that's what you're looking for.