The top right is stock .095 the lower 1 is a stock ring out of a torgueflight trans it is .110. Top right is a Spiro lock and is .085
This is what holds the 2nd gear clutch pack in the case the stock ones are know for popping so u can get the thick 1 which has more tension to it or the Spiro lock which is not going to come out!!
Now u also need to remember this mostly happens in the automotive world and may not be needed in a boat trans if u plan on not using second gear very hard. But it’s also cheap insurance. About. 12.99 for the Spiro!!!!!!