The old ring nuts with washers are a bit outdated as most shops use tapered seat nuts. I still have the old kit and the original washers were pretty bad. I wanted to buy some hardened washers but the sizes didn't match and they were plain steel (rust). I took a chance and found this one. Not only are they the right dimensions, but they're thicker so they don't get distorted. An added bonus is that they're stainless steel, so they won't rust. Not too expensive for a special item. I had to buy 2 packs.