The EHPro S-Kit has a beige insulator as well that looks to be PEEK. Bigger center hole and no threading for the AFC screw.
EHPro Kayfun V4 S Kit - EHPro - RTA’s & RDA’s
Im assuming this would fit the Tobecos too?? Kinda want to try one now and see if I can go back to my KF4s hehe..