<VV> Piston ring help

[judynrandy at comcast.net]

While looking in my parts stash, I stumbled across an individually packaged cast iron piston ring set (one piston's worth). I THINIK it is for a Corvair, but I'm not really sure what it is for.  
It is marked TRW at the top of the box and "10 up piston rings" at the bottom of the box. 
On the box flaps is says "RAMCO"  and  "piston rings".  Lastly, there is a part #:  On the top row it says TS8006M and on the bottom row it says 4087106. 
On the package inside the box it says: COMPLETE RING ASSEMBLY FOR ONE PISTON      and     8006M STD.  I know that part means it's standard size, but for what? 
     So, can anyone help me identify this TRW ring set?  Any and all help really appreciated.  Thanx. 
  
Randy (Cap'n) Hook 
'60 700 4dr '64' 110/4spd 
'63 '500' ragtop 110/pg 
'65 Monza 4dr. 84/pg