If you're in the US, order direct from RD Logics if your LHS can't help out. Great prices and wicked service!
If you look at their website and don't see what you're looking for, just use the contact form and ask them for the parts you require. You'll usually get an answer back the same day if it's on a week day.
Here in Australia, I get the same great service from the Australian distributor!
My blog: http://mikesrc.wordpress.com
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www.nbhc.com.au - www.teamxray.com