It doesn't look like rival makes inserts for that volume roaster oven - just their 18 quart.
When my sisters and I bought a roaster oven for my mom a few years ago, we purchased the buffet inserts alone. Most roaster ovens are pretty similar so it may be that you can find a set of inserts that are the same size as Rival's from a dissimilar manufacturer.
www.amazon.com With its noble 22-quart wit, this Rival countertop roaster oven functions as an substitute to turning on the full-volume ...
John Mayer, Derek Trucks, John Frusciante, Rolling Stone no. 1020, February 22, 2007
Two F-22 Raptors Fly over the Pacific Ocean
F-22 Raptor- Fathead
Over California, an F/A-22 Raptor Files a Training Mission Here
Beside the Sea No. 22, c.1962
Over California, an F/A-22 Raptor Files a Training Mission Here
Over California, an F/A-22 Raptor Files a Training Mission Here
Coffee Roaster
Flash: November 22, c.1963, JFK Assassination, c.1968 (Robert Kennedy)
Tracy Chapman, Rolling Stone no. 535, September 22, 1988
