Rear O2's with LT's
 

Has anyone tried using the rear o2's in the front when installing LT's on an F-body???

Not sure about F-bodies, but that is what happens with the corvettes. LG Motorsports headers come with an adapter for c5s that allow the rear sensors to be using as the fronts.

I have a question i bought Pacesetters LT's for my 98z and i bought 2 bosch 13111 vette o2's what O2 connectors do i plug them into the front o2 connector or the rear ones?

Both the front and back o2 sensors are interchangable.
98z28chevy you are going to want to put them in the front. Good choice with the bosch sensors, the stockers are known to go bad.