I'm sorry you're having trouble with this, but it's exactly what I expected. It's what I found, why I made my own and suggested you contact Pipes. He has most of the parts you need already and has the skills to make up the truly custom connector adapter you need to fit the 3.4 mm connector of the Pinnacle. I was able to make the ones I used since I'd already bought some of these inserts needed for my experiments with Ascent:
http://www.digikey.com/product-search/en?KeyWords=839-1215-ND&WT.z_header=search_go
This is just one of 3 common coaxial connectors with that OD (otherwise listed 3.4 mm) with different size center pins. I don't know if they are the 'right' one for either Ascent or Pinnacle but it does work for me and matches the connector I scrounged from my junk box (that barely was long enough for Ascent) and used on my first attempt at a 'gadget' charge controller:
Those parts are plenty long, but you have to solder wires on them. They're made to be over molded on the end of cables, likely similar to what's used on the old cable end I used (ironically it had a car cigarette adapter, but was set up for 12 VDC).
I seriously doubt you'll find this stuff premade on e-bay, which is why I suggested Pipes and said 'you're on your own otherwise'. He has the skills and resources necessary and a history of doing just such things at a reasonable cost. Those suggestions stand.
Otherwise, ONJ has nailed it. You can start with the Arizer cable and car adapter and see if Pipes will make you the necessary adapter to mate it up to the Pinnacle.
Good luck, it's possible, I've done it, but I don't think it is the way you're trying (or I say so).
OF