(1) yes (2) no spring needed cuz the M/C internal spring does the return. EDIT confirm that your MC choice has the circular recess in the rear piston "thimble" for the pushrod & piece of neoprene retainer (that slips on the pushrod recess behind the end rounded nub) to lock into & if you do not have the neoprene piece a snip of vac line from your parts house works fine. The ones that come with some MC's have a shallow notch lengthwise in it & not sure if that is to let air excape as you lock it into the thimble groove or if it is just a mfr thing that happens when they cut it.