There is a culligan kit out there, some of the dealers will sell one and then there is another place that will sell a kit..
There is a little debate as to this kit working for the unit that you have.
CULLIGAN 01013033 Seal Pack/Brine Cam Kit NEW!!
The number that is for yours ends in an 83 but about the only thing that I can think of is that there where some changes to the o rings in the kit and that might have changed the number.. out side of that I am not seeing any difference between the two.
You might also get some more time out of the unit by breaking it down and using some new silicone on the o rings and cleaning up the rest of the valve, depending on the water that you have, high iron and hardness will shorten just about any valve that is on the market.
Some of us have come up with a kinda parts book for the culligan units..