-52 Casting Number (NOT -52A) It won't work on a Sportster with one-piece shaft/generator idler gear. This is for the K Model engine only (maybe a 1957 XL still had an idler shaft (like a 45 or a big twin)?
Last month I went to the Yucatan and stayed in Valladolid for a few days, then hiked Ek Balam and went to few cenotes. I like to stay near Punta Sur (on the south end)of Isla Mujeres too. This gal at Playa Norte was doing maintenance on her scooter in the street. Fixing corroded connections, making sure the lights worked, etc. She bought it new, it was stolen a few times, lost for almost 6 months on one occasion, but she always got it back. Nice gal. Everyone I meet in Quintana Roo and Yucatan are nice. Someday I'll take my WLA down there and get lost for a few years. I love it there.