Yes, it is the long one. I'm 6'1" and it put me in a comfortable , aero position without a curved slider. I bought it in August after riding with the crew on the BRAG retreat. It was $220 plus shipping new and only shows mounting scuffs at the derailleur and wheel hub mounts. It will fit the models pre-carbon forks and thru-axles. The 23.5" measurement is from center of axle to center of bottom bracket and was measured with my Stanley 30' carpenters tape.
That's a pretty lookin'V in your profile picture!
Jeff, thanks so much for the informative pm interaction...at 5' 10" as you expressed, I think it would require more modification than I want to commit to so, I am letting this go to a more worthy individual. Best of luck...