Ah, ok thanks k1114. Yeah, OP I think your best bet is Antec. If they don't straight up sell the spares, as you imply, then speak to their customer service to see how to resolve it.
ETA: I've been doing some Google searches to try and help you out, and it looks like you're right, there's nowhere to buy them. Call customer service and/or tech support, I bet they can help you.