I think there is an aftermarket one still available. I'm looking for one too, holding out for OEM
https://forum.ih8mud.com/threads/san-antonio-tx-heater-lever-light.1293371/#post-14601076
Sorry for false start- I thought only the top part for the cleaner was missing from the description. Didn’t realize (aka I didn’t look) at the bottom photo showing what is missing too.
My bad. best