There was a seperate thread on that front end, I had posted to it.
The tire looks like an old/remake? of an Avon 5.00x16, that is a tall tire with a narrow side profile, it may fit where others will not.
Also you can grind a bit off your fork legs where the tire touches.. not recommended but if you only do it in that spot you still have 85% of the original strength.
I will check the rim today, it is size stamped, I think. I think its Honda..being belt drive narrows it down to only a few choices even including Kawi,, then its just order oem, or from a salvage yard.