I don't know what lathe you have as the numbers and letters in your subject are neither model numbers or part numbers. But assuming that you need the half nuts for an Atlas built Sears sold 6", 9" or 12" lathe, call Clausing @ 1-800-323-0972. They still stock new ones (or did a few months ago). You can also usually find them on eBay but new originals are usually higher price than at Clausing, or are brass, which won't last as long. And you can actually still get they through Sears Parts Direct. But again at a mark-up.