For my 2004 Sunrise I simply got a 4 inch round assembly from some store such as Harbor Freight or some such. Lots of truck stops have 4 inch round ones as well.
EDIT
OOps I see yours are square. I'd still look around the stores above. Might have to change a pair though.
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2004 Itasca Sunrise W22 chassis GM 8.1 Allison 1000 Towing a 2007 Chevy Cobalt four wheels down.
If you swing past a Bago dealer, in the parts department they may have a stack of Bago parts catalog. It comes in handy. Or write to the BAGO gods and they may grant you one via mail.
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RUSTIC is good.
Kudos to those who make Local, State & Federal Parks & Campgrounds possible and to those picking up the slack by Providing Private Campgrounds.