yup, 45 mm. it's a '96 328is, built May '96. i have a 36 mm for taking my oil filter cap/cover off. could the "s" have anything to do with such a large nut? any real trouble getting the inner race off? do i need a special press for getting the new assy. on? thx, bob in houston. (p.s., your fix for the drive cables on my power seats was a great help this weekend. thank you for your expertise.)