Loveseat Wassell Frender Bracket
$35-40 USD 
This Bracket bolts to the underside of Most Butts seats and allows you to solidly mount the seat to a ribbed fender, allowing the seat to sit directly on the rib while better supporting the passenger.
Comes with hardware.
This will also fit the Backseat and Lazyboy perfectly.
Available in Nickel Plated and Raw.