The axle nuts should be available at your local HD/Lowe's, it's just a cap nut that you gently hammer on. The actual Weber part number I'm finding is 987101. As far as the axle, if you're looking to replace it I recommend measuring it and ordering a SS rod from Amazon. Will last much longer, won't rust and will stay looking good for a long time. You may have to cut it to length with a grinder wheel - takes about 20 seconds, but wear eye protection. Personally I prefer using SS shaft collars in place of the hammer on caps, but of course they don't look original. Good luck!