Dug,
Order both sizes available from VB or MOSS to makesure you end up with the right one. Don't go to local hardware store. Steering wheel nuts are made from very soft metal so that when you cross thread the column the nut strips out first(Don't ask me how I know). They are very cheap and since I was shipped the wrong size first time I recommend ordering all sizes available. BTW - Sear Hardware sell a thread file to repair those steering column threads. Do it the right way, and order the nut. Far cheaper than replacing a steering column.