Based on the last batch of rulebooks I looked at: NEMRR - 500SS/SB (I expect that to last right up until one grids up, then banned.) Not ULSB legal, so you jump straight from 500 SS/SB to LW SS/SB, and thats where I expect them to stay. LWGP / GTL, LW Formula 40, LW Sportsman, possibly stay legal for ULGP as well? CCS - Things got heavily redone, LW SS/SB/GP, GTL, LW F40 WERA - D and Formula 2? I haven't checked AHRMA yet.
Hah, had I paid attention to the subforum... but noooooo, full wrong steam ahead for me! :P Got me curious now, I've still not decided what my racing is looking like for 23/24, and I do enjoy endurance...