These are the "seals" that give the lock mechanism the proper height and allow it to rotate in the shaft body of the door lock. OEM was plastic, these are aluminum. They will last much longer than OEM, and with some marine grease, they will be a better seal.
The entire thread is in the garage, but though I'ld post here as many don't make it over.
http://www.914world.com/bbs2/index.php?sho...p;#entry1324321
Sign up here or there if you want some.