Almost all the tins on my 520 are bad, salvageable but very rough. I found floor boards, hood, fender and tunnel parts a while back. Today I picked up a set of 23x10.50x12 Carlisle AGs. Impressive to say the least. Look lightly used and the price was too good to pass. The deck is done, I'm fighting the urge not to dig into this tractor but this time of year is very busy with cleanups and lawns starting soon.