Ahhh.... newer stuff. Check with Moyer's above. Their site also gives phone numbers to their locations. If they don't have it, they probably know of others that might. Having the RCA part number and model number of the set/chassis will be a big help when you call.
You might also check this place out...
http://www.partstore.com/Default.asp...w=rca&s=google
Punching in the model number of your set pulls up the service manual. Try the part number you need... maybe it will pop up as well