I first contacted Coleman (Airxcel RV Products) with my model and requested the part #. I'd seen on the JOF many who have used the Supco Hard Start Kit, which cost less and is on Amazon as well as eBay. I asked Coleman about using the Supco. This was the email response:
The 8333 series had a start kit that was available on most models. Yours however did not come with it preinstalled. The part number you are looking for is 8333A9021 and it would be available from Camping World. I do not recommend the Supco caps, as they send a huge burst of voltage to the compressor at start up, which will over time damage the compressor.
Thanks,
Mike Dickey
Airxcel, RVProducts Division
Technical Support Coordinator