Theres a small bulb inside the switch that needs soldering off and on. Small red cap on bulb which you need to keep to place on new bulb. The size of bulb is on the forum somewhere already
I dont think they make it anymore for the type R. Link above sells the iS and S versions but rings are all the same. I'd def be interested if you were able to get some made up
You have to buy the full modulo set mate and its not cheap if you're just wanting the rings for the vents. I'd like them too but wouldn't want the whole set either.