If you get the corian lot and run number which should be taped underneeth the counter and find a counter top company have them order a piece for you or if they have a scrap piece close to your color, then if you have a good table saw with the proper blade saw it to size then get a router bit preferably 1/2" shaft then give it a porvile that is simular to the one you have now, it is realy easy stuff to work with, easy to fix OPP'S providing you have the right compound and color. I am not certified for Corian, but I am for Avenite which is almost the same stuff but a lot more colors and paterins to pick from.
As far as getting the option from Keystone I'll bet they will ask 3 or 400 for it if you got anything from the it should be the run number and color, then take it to a shop around your home for the work.
Pulling a 2004, 2980 RL an oldie but goodie.
Tow vehicle is a 2009 RED RAM 3500 DRW.