On the Track/Kick you can't fit the A arms without the front diff drop brackets. The A arms are a tad wider and the driveshafts are then around 3/4" too short.
I think you probably hit the nail on the head right there.
Most people out there would expect Calmini to know this, and warn them of this if they called in "just to order A arms". Most everybody would be pissed if they spent the extra money on the a-arms, installed them and then realized they needed to buy more parts to make it work. Then people would expect them to "warranty" their parts that are being installed into peiced together lift kits, in god only know what configuration.
Personally, I would not sell peices if I were them. I think it would end up being more of a headache than it would be worth.
Zig