I'd bet your steering damper is aftermarket.
As for the quad shocks, if done correctly they can ride and handle well, and they should give better jounce control than single shocks. But not everyone realizes that there's supposed to be a different shock ahead of the axle vs behind the axle. The catalog shows that, and Monroe knows that as they explained to me when I bought the Sensa-tracs for Dad's truck. They really improved the ride and handling on the truck. But many people just double up on the shocks, which stiffens the ride.
If you have all the hardware you can bolt it on, although you do have to take a lot off to get down to it. Compare the illustrations on the Single Shock vs Dual Shock tabs on the 4wd tab here: Suspension & Steering/
Front Suspension.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI