Go to the forums in Saitek's website.. the customer support there is outstanding!
I'd be willing to bet that if you asked, they'd probably just send you one. I've seen them ship out for free small parts such as switch assemblies, springs, etc...
If nothing else they might sell you one cheap. Look for the guy, "UKSupport".. he seems to be the one running things on the message boards for Saitek.