MHD Starter-Alternator mounting point bearing liner service repair kit for the 451 fortwo.
Kit consists of a new (more substantial) fixing bolt for the starter-alternator and bearing sleeves which are fitted in place after re-drilling the mounting points.
Smart also recommend replacing the waterpump pulley and replacing the drive-belt (both available separately).
Two versions of the bearing kit are available depending on which version of starter-alternator you have fitted:
Type I (A1321500116): for starter-alternator part # A006 151 90 01
Type II (A1321500016): for starter-alternator part # A132 906 00 26 - fitted from Chassis # K486605 (from 19/04/2011)