Morning Chopper.
There are several styles of roll bars. The 2 most common (other than cages) are the A style and H -style. I'm not sure when they changed from A to H style in the YJ production though (1990??)?? Is this the "Cab Cover" you have by the way? The duster I'm familiar with ...
A-style . 
. H-style . 
Pics from Moris 4X4 Center www.jeep4x4center.com
In 93 (or 94?), they went with a different front foot for the H style bar for the Wranglers. Instead of being bolted to the floorboard and wheel well behind the fronts seats, they stood it off the wheel and just bolted it to the floor. Looks the same, just the front mounting was different. Not sure if the upper bars are longer to have the rear mount in the same place though :-|
The measurements from where to where are on page 3 of the installation guide at BESTOPS installations page.
Applogize for the links, but I'm on the road and it's a big hassle to save and host the images (slow connections).
Mudrat
