Oooh, that's getting into tempting range.
I'm curious, have you actually used these stands with your MBs? In looking at them closer (the pics on your site), I wonder if the pad might compress too much in the center (especially since it appears to be heavily slotted) causing the edges (where the metal lips are under the pad) to contact the side of the car when used with the car's rubber jack point.
I have a similar problem if I try to use my rubber-padded jack with the car's jack point.
The rubber on the jack point on the car itself also compresses quite a bit leaving very little clearance.
I guess ideally, a flat incompressible metal pad on the jackstand is what would work best for this specific purpose.