Quick update... haha see what I did there?
I did a very quick test earlier today. I was able to raise the 911 successfully. Didn't seem to have any problems and I may play around with best places to put the rubber blocks, but the first test was good.
So it seems the BL-5000EXT, even with it's longer length, is still fine to use with the 911.
I did feel a little better with the E350 having the ramps right at the edge of the car. The greater distance between the ramps is more stable. It seems that even with the shorter version of the QuickJack, the ramps are set more inboard with the 911. This model isn't any different in that regard so I don't think it will be an issue.
Like I said, I ran out of time so I didn't study it too much.
One thing worth noting. I wonder how many QuickJack users also have A/C? It seems that the placement of A/C and oil lines makes choosing good lift points a bit more of a challenge.
Here's the pics...
NOTE: After more experimentation, this is not the correct way to lift the car. The ramps should be oriented the reverse of the way the are shown in this picture. The hydraulic shaft should be pointing at the weight bias end of the car. The orientation shown is normal for front engine cars but should be the opposite for the 911.