Hi Morph,
I have the double flex arms. I'll try to remember to measure them tonight after work. When I had the kit installed, the kid who did the install must have never installed a lift kit before, as he didn't adjust either the arms or the DT track bar, and so the front axle was waaaaaay to far forward and a good 2" off center. Since I had never had a lift on any vehicle before, I didn't even think to look it over before I left the shop.
I'm quite sure the new arms are about 1 - 2" longer than the OEM arms, which I still have at home, so I can give you exact measurements on both sets of arms.
Disclaimer: I readjusted the new Skyjacker arms and DT track bar by myself at home, so I may not have them in the absolutre most correct positions now either...
Tom