I should have known that Bob uses good fastners. For those of you that don't know the Stover is a ovaled nut that take the circular shape when threads locking on to the bolt. Very similar to the MS21042 grade locking nuts. I don't know the tensile strength of the stover but they say they are good for 400 degrees F. where the MS21042 is for 450 and a tensile strength of 160,000. Now that is one tought nut to crack
You local airport repair shop or a catalog from some one like Aircraft Spruce with fix you up.
Don't forget your washers! A washer under EVERY nut.
Rick