Using your stock drivers as a guide, find the center of the drivers. We will use the Polaris shaft for an example. I measure from the end of the drive shaft to the center of the center driver. The stock measurement is 9.1875".
When you are done installing the new drivers. There should be 8” between the inside edges of the anti-ratchet points. So 9.1875” plus 4” equals 13.1875”. That’s the measurement for the right-hand driver. The left hand one is 5.1875”.
Be sure you support the middle of the drivers when pressing the shaft thru the drivers. They can be warped if installed incorrectly. Also only put the second one on the shaft about .25” or so. Place the drivers and shaft on a flat surface. You might have to adjust the second driver slightly with a mallet to get rid of any rocking of the drivers. When you are satisfied put the second driver on.
*All Polaris model sleds have to shorten the front of the rails to make room for the conventional drivers.