should be no problem to find what you need. I think they are called faucet coupling nuts and are available in plastic or brass.
you don't need to go here, but here is a link to 2 places that sell them. You may have heard of them both.
http://www.*********.com/h_d1/N-5yc1...atalogId=10053 H O M E D E P O T dot com was censored out