It's been more than just a few minutes since I last got one of those kits, but if they're the same as the three I've purchased to fix other Spyders were, then you'll get
EVERYTHING you need to install that 'Air ride-levelling system' as a 'plug & play' kit on a Spyder that didn't come with it standard - so effectively, you could rip out
EVERY part of your original factory installation and replace it with the new items from the kit, but I'd only do that if you're really into pain and like doing things repeatedly only to still end up with the same problem!!
The ACS on our Spyders is one of those 'nice idea,
REALLY POOR execution' things!! They fail, they leak, the compressor is poor quality, the replacement parts are expensive, problems are hard to diagnose &/or fix, the standard shock/coil isn't really up to the task of keeping the metal/plastic bits off the top of the rear tire anyway, they don't really add any true advantage &/or benefit to your ride, and you almost invariably
WILL have some sort of problem with it at some stage!!
So I'd suggest that you cut your losses now, and if your air bag isn't leaking (spray on soapy water & look for bubbles to check!) then either convert yours to a 'manual fill only' system by re-routing the air line direct from the schraeder valve under the seat to the air bag and setting the pressure to whatever you desire (a small bicycle pump will work for ad-hoc changes if you're that way inclined) or toss the ACS entirely and fit a better shock/coil combo.
I don't know of
anyone who has ever regretted going down either of those paths above, but I know of a fair few who really regret trying to persist with the invariably problematic factory ACS set-up!
