Remove the existing cup holder, carefully pry off the alum. end caps, use a 3mm Allen wrench, take the thing apart.
I cut off the front holder, with a metal blade in a saber-saw, and smoothed the ends with a Dremel tool.
I cut the plastic base also, and modified the front rubber "flap" to fit in between the new arm.
here it is back together on the new supplied plate from Strat.
Here is what it looks like when it's assembled.
Here it is on the car. It uses the rear existing cup holder mount on the rear of the tunnel.