I got the 8264636 - Cherry Keeper +ACI-Headlock+ACI Cage - Short Headlock with extra-large Head Keeper (the smallest opening). It fits well and my pee hole stays centered so peeing is so much easier
I actually had a reaction to the older black dye as well. I'm thinking about trying to seal all my ck cages with this ArtResin - Epoxy Resin - Clear - Non-Toxic - 8 oz (4 oz Resin + 4 oz Hardener) (236 ml) https://www.amazon.com/dp/B01BX6893Y/ref=cm_sw_r_apan_i_EPC09Y6S6HSMEEV82963