http://www.milltrailers.com/trailer-parts-accessories/shopexd.asp?id=786
Yikes $600 FWC will sell them to you or around $150 if I remember correctly. If you are putting it on an older model you have to make some adjustments to the couch to make them work. I have been wanting to do that mod myself to my old Fleet but haven't wanted to spend the money.
If anyone does a dinette mod and wants to sell the brackets I'd be interested.