If the O/S rings you need are for an Tecumseh HS40, they are pretty much "unobtainium" unless a member squirelled away a set or two years ago when you could still find them. One way to go if you cannot find just the rings set is to purchase a repopped .020" O/S piston AND ring set from Blackwidowmotorsports. http://blackwidowmotorsports.net/t12982_tecumseh_piston_ring_set_020_oversize_for_hs40.html
While purchasing OEM Tecumseh would be the preferred, I have purchased repopped items from Blackwidowmotorsports that I have always found to be of top quality.
Michael
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