If you are in Chiang Mai I can show you a place that may have what you want.
In AU its called a motorcycle wrecker, in UK I think its called a motorcycle breaker.
The owner speaks no English, but I’m sure he/we can work it out.
Bring a photocopy pic of the bike and tank, and who knows. This man has lots of stuff.
Its not a shop, its more like a piece of land with sheds on it.
Its near Night Safari. If anyone else wants to come, please do.
You can contact me on here. Please do not ask for a Google location,
as I need to show you where it is, otherwise you will never see/or find it.
As I say, there is no shop, there is even not a sign nor anything.
This was a chance find for me one day on my MTB, and I promise you, even if he does not have
what you want (who knows), this place is well worth looking at for now,
and for future reference. Also, if he does not have, maybe he’ll know another
place that does. I’ve never seen another like this place anywhere in Chiang Mai.
It reminds me of places I saw in the 80’s & 90’s back in the West, but its Thai.
Maybe bring a Thai - Eng speaker if you can. Remember this is in Chiang Mai.
Best Regards from Biggles.