Installed a set of the Reflex shocks on my Overland with UC last month. They list one for the stock suspension and specifically say do not use it on the UC. Here are the numbers for the UC version:
Front 911522
Rear 911523
They will give a nice highway ride, with no harshness and also reduce the body sway.
The problem I had with the other shocks (Bilstien, MX6, etc) is the initials gas charge is in the area of 360 psi, way to stiff for a daily driver. I believe the Reflex is around (240-260 psi).
Also, note the Reflex for the stock suspension is a low pressure twin-tube, while the Reflex for the upcountry is a high pressure mono-tube shock.