Here are a few pics showing some rubber padding I put under the front of Ron's 'lux-a-rest" to help position it to the console. Ron designed the rear of the arm rest to nicely anchor on the drive shaft hump, The arched rear support bracket holds the arm rest up high enough to where it clears the rear ashtray. On Ron's '82 spider, the front of the arm rest sits squarely on the padded console just behind the parking brake lever. On earlier spiders, the console is not quite so flat in this area as shown by this picture. (click pictures to enlarge)
The raised portion that surrounds the parking brake lever is off center toward the passenger seat. I put a .6" thick rubber pad on both sides of the underside of the armrest, so that the rubber pads straddle the console and hold the arm rest centered. As such, the arm rest sits on the outer rails of the console rather than resting on the center raised portion. The rubber pads are made from 2 layers of 5/16" thick adhesive-backed dense foam rubber. The pads are about 1 3/8" apart, and off center, such that the arm rest is held centered over the console. Another small single layer of the foam pad is placed so that it sits inside of the raised bump on the console, to keep the arm rest from sliding backward. This shot shows the pads on the lower side of the arm rest.
This shot from straight on shows how the pads are off center to match up with the off-center bump on the console.
Here's an attempt at a straight on shot with the arm rest in place.
From a normal view, all you see is the clever "lux-a-rest"! And, per Ron's design, can easily be removed to lock it up in the trunk.
