I don't know if this is stock dimension or not. It was in a race car when I bought it. It seemed to do a good job of keeping a mildly worked 4AG cool during circuit competition.
I sold the car as a shell a few years ago, and this must have got left behind. Just found it during a garage clean-out.
Dimensions are approx 625(w) x 420(h) x 40(d) Including the tanks. The filler neck comes up a little higher than this figure.
When I pulled it out to measure and looked at it, its not quite as new as I remembered, but still was in good working condition with no problems when it came out of the car, so down to $100.