The ESX242 that you reference is for the LNBF not the dish.
Be sure to ask the seller what size the polar mount is since that information is not in the ad. I'm betting it is 2-5/8". If so, you will want to refer to the thread on this site for setting it up because a pole of that size is not easy to find. Info here: http://www.satelliteguys.us/free-air-fta-discussion/228237-6-foot-dish-install.html
Also...wait and keep watch...that dish will be occasionally offered as an auction item at a substantial discount over buy-it-now. Buy the LNBF separately (from the same seller, if you like).