I have been meaning to give you a call, I do hope Angie is doing ok.
Anyway if it was me I would go through all the Jap bikes that have the same bore size
and have a look at the rings. you maybe lucky finding some that will do the job.
As most of you know, I got some Kawasaki ones that fitted my 1mm oversize pistons
some time ago and the only difference was the oil control spring.
But I’m sure somebody said they found some std one’s in Germany!
Anyway will call soon. Cheers Gary.