When you measure your universal joint, measure the length from one outer end to the other (D). You will also need to record the width of one end of the universal joint (C). Use these numbers to find the right size of a universal joint.
On the Domestic type like this one, the snap ring can be of type A or B.
If you are not sure, please contact us at 1-888-997-2624 and we will help you determine the right series.