Who sells Piston Rings / thermostats?

[froggy]

Stripped the engine down due to bad running / no power and have managed snap a piston ring (not sure if i snapped it or if it was snapped already).
There is no scoring in the barrel so hopefully a set of rings and i should be good to go.

Also can you get / do you need the thermostat as i managed to snap the link bar (it sheared inside the thermostat)