Really there is only one...it is a plastic retaining clip that damn near breaks just by looking at it. You might not actually have to buy a new one though. If you bought your shifter new, they now include that clip with the shifter kit...so take a look through the box first and see if it's in there. If you read the instructions that are in the box, you'll see very quickly if it is included in your kit or not.
HTH,
