Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
They are 233 bulbs. You can get led replacements, but make sure you get coloured bulbs, white led's behind coloured lenses give out a distorted coloured light. Hve a look at the website classiccarleds.
In my opinion it has no real use to replace those lamps with LED's to lighten the electrical load, none of them light for any length of time! When your oil lamp lights for any length of time while riding you clearly have other problems than the state of the battery or alternator, neutral lights only while stopped, signal lights are only used occasionally, and only light 50% of the time, and the high beam won't be used for long until one of the other road users complains about getting a headache from your eye splitting headlamp
I found 3.4v bulbs here. https://www.ebay.co.uk/itm/402522464400?ViewItem=&item=402522464400Came quickly but haven’t tested them yet.
Oops!