If you have a part number, I can always order it for you even though is not on the website.
I don't think the new Yokomo bodies are available in a twin pack, they might in the future, but for now, they are available in single packs.
For warranties, you might want to check with Integy directly (Personally, I'm not sure how their warranty works). I do know that they have replacement tips available.
Thank you very much for your kind words. Hope you like the car kit!
Speed Tech R/C