Are you talking about the woodfuff key? The hodgemoe that sits in the cam's slotted area?
Sometimes things like that can be hard to find: NAPA has gone to hell in the last few decades, becoming just another parts house with flunkie employees.
If you cannot find one, I have a complete assortment of woodruff keys. The problem, however is that there are quite a few different sizes. My guess is that my kit has about 9 sizes that look as if they would right.
