Guys a few more pictures I'd thought I'd add. Hitachi HFD305S original HFD305SX mine
Notes .. Dual colour LED on original drive just Red on the one I have
Note mounting points on underside ringed in Orange. a pair of holes needed in undersidee of Microdrive case to secure.
Note Power plug... especially important as if the replacement drive works I'll be cutting a hole for the power plug through rh steel support directly behind the drive.