I'm sure you could just search the Intardnet for a replacement throttle for your X-45, probably can find an inexpensive one on eBay or through Amazon. If you just need parts, I'm sure you can go to Saitek's website and order whatever part you need, must joystick manufacturer's do offer such services.
Oh crap, just read your signature and found out you're ignoring me, so disregard my post.
ack-ack