My local Flaps Also has a pegboard full of them. They are just a sort of pressed steel and painted, nothing fancy. I've even seen some sizes in China junk tool stores. Measure accross flats and check those stores, not chain stores. They aren't cheap, between $25 and $40 for most I bought. If you just have those cut-outs in nut for the lock washer, there is a special one of those too. I had to order mine. Just got one 3" for my MM tractor axle nut, how's that for large. They have up to 5" I believe, wow!
