Thats the same as the GNX cooler, I had one that I bought from the dealer and had on my GN till I installed the front mount. I had to make my own brackets, it was quite a project. You can still get that cooler from GM #3058200 for $71. from P&G Chevy or $62. from GM Parts direct. Don't know if you can still buy the brackets.
Tarey D.