According to bartek you dont need a woofruff key, i cant personally see that working as when under hard load itl probably slip, but i may be wrong
got it off ebay, a germen guy sells it, but its the same kit as bartek sells. The quality looks spot on, and theyve taken the effort to mill a keyway in the charger pulley, so there must be good reason they didnt do so in the alternator one.
will soon find out if it works though
Taylor