I dont use Facebook Bill but the link will be useful to those who do.
The Triumph and BSA spares are getting very hard to find genuine parts although the Harris made ones are pretty good. On another site, hepolite new parts seem to be very poor. I did buy some hepolite piston rings but they were miles too big and would need cutting of the rings so i re-used the old ones again.Recently bought an exhaust valve and it looks good so waiting to see how that wears compared to the other 3 old Triumph valves in the head. For the moment, i will give hepolite a miss for parts. Lucky i have accumulated quite a lot of old Triumph spares collected in the last 25 years.