jlzr580mod, welcome call to ArcticChat! :chug:
There is no actual complete 'kit' available... It might be an idea for dealers or aftermarket retailers to offer up kits made from new or used parts. They could also pre-machine the spindles, install zerks, and include arm spacer-shims as well. It would be so easy to make an AGLT kit.
Best way price-wise to go about it is used parts. But there might be pitfalls along the way, like getting wrong parts, rusted or bent arms, wrong spindles or arms, etc. Bad buys are not the majority though, most are good from what I can tell.
When buying on the internet, dishonesty runs rampant and trust is often stretched so risk is always part of the equation. This is why I think a dealer or aftermarket company should offer the kits with or without machined spindles, and also a choice of brand new or used.
Brand new parts are pricey, especially for an older sled. As for me, I'd buy brand new because I plan to keep the AGLT modded sleds for as long as it takes for Cat to come out with a brand new sled that can handle as good... Which may be never, so I'll know up front I'll be owning & riding these AGLT machines for a very long time.