I removed the whole thing - cooler and lines and blocked off where the cooler went and where the line that goes into the block went. I changed to a different upper radiator hose as well.
I bought a block off plate (p/n 12577903) and a block off plug. I do not know the block off plug part number. I ordered it through gmpartshouse.com. The original part number (block off plug) I ordered was no longer in production or was superceded. However, they came through with a replacement. Their site doesn't show part numbers so I am not sure. The invoice for the original plug says "oem catalog" the one they sent comes from the "accessory catalog". They are the same price and probably the same item.
I also read somewhere that factory Non Z06 corvette oil cooler lines will bolt in.
http://parts.nalleygmc.com/showAssem...rimLevel=14233
I cannot remember where I read it though. Obviously, you would have to clip the lines and adapt them an external cooler of some sort. I am not sure of which would be cheaper, using an aftermarket block or using the factory one from the vette.
I tried to find the pn for the block off plug but cannot find it. I suppose you could contact gmpartshouse.com and have them reference order 28749601 (my invoice that included the plug)