Whoda thunk this could be so hard. Two stories here. First, I called Gorilla and spoke to a fellow who led me to some of the suppliers mentioned above. He also clarified the part numbers 66147 and the impossible to find 66148. 147 is the four pack and the 148 is a "bag" of lug nuts sold by them to the retailers. But I have not been able to find the bag amount anywhere. Calling Summit, I was led to part number 76845 ($78.99) which is a pack of 32 and contains four locking nuts. Looking at reviews I find that all these so far are two piece lug nuts, much like the originals. So it appears you spend $21.99 x 8 to get the same lug nuts but without the locks. At least the descriptions are the same.
The other story is that I have an Apple computer and the go to search engine is on a program called Safari. My daughter installed Google Chrome which is also a search engine but I don't use it. At least I didn't before now. Turns out the fellow on Gorilla's tech line was pulling up on line businesses they sell to but I was not seeing the same info. Once I used the Chrome, I saw what he was seeing, and what many of you were seeing. Since then, I searched the sites that carry the Gorilla brand and found Summit 76845 seem to be the best choice in that brand if you don't mind the four lock nuts for which you could not lose the socket. Or maybe buy one pack of four 66147 to replace those.
Found that Summit has a six minute video on lug nut types and uses. Informative and includes our diesel truck lug nut. There are a lot of other brands out there and I did not find an explanation for the Lifetime Gorilla lug nut, or what the warranty would be. And not all of theirs are advertised as Lifetime. So it might not matter which one we chose as long as it's the correct 60 degree taper, 2 inch length and 14mmx 1.50. And in chrome or black. I was on one website, OTC I believe, and there was over 20 pages of lug nuts to sort through and none were mine. Good grief! Now I should just order the Summit lugs and try to put all this nonsense out of my aging brain.