I was thinking it was a Setrab cooler. Either way the lines are not cheap you are probably looking at a couple hundred bucks just for the lines and fittings.
It looks similar to part number 50-625-7612. Retail of $370 (which you know Dinan isn't paying that much)
http://www.setrabusa.com/pdf/2008-RETAIL-Pricelist.pdf
http://www.setrabusa.com/pdf/ProLine...Capacities.pdf
http://www.setrabusa.com/pdf/Setrab%20USA%20ProLine.pdf
I'm thinking a grand is more than a fair price.
Disclaimer: Don't quote that part number if you are planning on doing your own retrofit. I was just using approximate sizing and volume to pick a similar part as what they might be using.