I don't know for sure, but it seems to me the rimblow switches are very similar in technology to the "push to request stop" tape switches found in many city buses. Perhaps a couple of phone calls to coachbuilders such as Neoplan would get you pointed in the right direction. I have no idea how wide of a switch tape you need, but take a look here. Perhaps they can help you with a near-exact replacement (when you send in what you have for their evaluation). I found them by googling "tapeswitch".
UPDATE: Here y'go. Expensive? Yeah, but this was the lowest price I found...the average was $140 to $180!
