These are the Corbeau VX 2000.

The base is 20 inches wide and 23 inches deep. It is 22.5 inches wide at the shoulder. 35.5 inches tall.

It's gonna be a few days before I can measure my car, so I was wondering if someone already had the cockpit dimensions comitted to memory.

http://www.corbeau.com/brochure/VX2000.shtml

Gee Im trying to remember without going out and measuring it again seeing how it is 3:45am, I believe there is 22.5 inches from centre of console to door sill. Depth is always a problem as the seats sit very low in the 240 and alot of other seats will increase your ride height and have your head hitting the ceiling. The only other alternative is to lower the seat rails in the car.

My preliminary discussions with other Z people and Corbeau indicate that all dimensions will be fine, except for the shoulder measurements. It may be just a hair too wide. Since these are awesome seats, I am trying to come up with a way to determine for certain if they will fit.