Michael. I assume that you are looking for a castellated nut so that you can pin it. I just drill a 1/32" hole in the nuts and safety wire them. That's probably safer in the long run. Will that work for what you need? JL James Lea PO Box 25 Rockport Maine 04856 1-207-236-3632 1952 MG TD 1952 Triumph Mayflower 1958 Rover P4 1962 Austin Healey BT7