The shaft and housing is at Tom woods right now. But I know the measurements. 2”ID 1/8”or .125 thick.If you talking about a replacement snap ring, you may have to go to transmission shop. There is no place on line that sells this snap ring that I can find. I would take the main shaft to a bearing supple store and they may be able to find you one.
i asked and they don’t have them. I will try torque king. By the way does anyone want some 6lug 10bolt axles. Off my k5... they are free and In Michigan.Torque king has a bunch of snap rings.
You might call and ask Tom woods since they have the shaft. They might have what you need