Welcome to X world!! You'll enjoy it! No other bikes out there like it. And you got it for what appears to be a very good price.
What's the last 4 vin numbers? Color? Mileage? Options? etc ...
Get that X on the registry.... as all of us X owners like to know where they're at... especially if they're in close proximity to ourselves.
Lots of informational sources here on the ol' www....
As for your missing pieces... there are several vendors .....
Atlantic E-H..... John's Super X.... Charlie Brandon... Russ Fullen .... all very good vendors. which you can find on this link....
http://www.excelsiorhenderson.com/pages/tech/partsservice.html Also Terry Callahan is listed on this link, and most of his parts he still has, are pretty much whole sale. If you're patient, those parts may very well show up on ebay for a lower price, but I'm sure these folks listed above have them also.
I don't know if your X has the updated tunes.... but if you purchase the SuperXtune from Tim on this same link. You'll be able to trouble shoot your X. If you don't have it already. If you budget is a bit low..... OBD I, you can trouble shoot thru codes. Tim is very helpful with tune, if you get cornered... its a great product.
Feel free to contact me or anyone else you feel comfortable with here, or your choice. Most of us really enjoy helping each other....
Bruce Whitefoot