Here's some NAPA #' BK 641-1615, (stud I think) BK 641-2000 (Budd Nut), and BK 641-2011. I can't remember if these are the right or left handed threads, I think right? Don't even try to use the crappy NAPAonline site, says "no match found" I called my NAPA gal (yup gal, she's a, a, a, she likes...