I understand that Bosch made spark plugs for Model T back in the day.
Two questions on this topic:
1. What would be the Bosch part # for stock Model T?
2. What would be the Bosch part # for 18mm plugs suitable for
a Rajo BB?
Keep in mind I am asking about old stuff, not current Bosch part numbers. Who knows, however, maybe Bosch still makes stuff for stock Model T and Rajo BB!