I just measured between the exposed pinch weld cutouts and I'm a little less than 70" on my car. I have the ZL1 Addons adapters on the front. If I get those for the rear too I think I can use the 5000SLX. I have removed the rear pucks since my SFCs used the area.
If you have SFCs installed, you should be good with the SLX.
I have the 7000SLX, and bought the extension adapters to go along with it. Figured it would give me greater flexibility with different cars.
Welp. Problem was, that once I placed the extension rails on top of the unit itself, the car was too low. So I ended up having to make 4 ramps to place in front of each wheel to drive up onto to gain clearance. Not ideal.
I bought the BMR Subframe connectors and put those on. You lose the rear rubber puck, but you gain a rail running pretty much the length of the car. So now I can jack using the front pinch weld cutout and then a spot near the end of the subframe connector. I don't have to use the extension rails, and by doing so, I have clearance without the wooden ramps.
Plus I have a subframe connector.
It looks like BMR offers the same thing (minus the connections to each other) as an jacking rail.