I’ve just received a newsletter from Baader launching their new generation of photometric filters (Bessel and Sloan).
https://www.baader-planetarium.com/en/blog/coming-soon-new-baader-sloan-sdss-ugriz-photometric-filters/
https://www.baader-planetarium.com/en/filters/photometric-filters.html
Unlike some recent “Bessel” filters at least these do appear to have the right shape passband though I could not find any detailed data.
Cheers
Robin