oh dont worry about that! just send them all to me and i'll sort them out for you!
seriously though, an easy indication is the amout of material on the top of the cylinder, and the exhaust port size. if there's noticeably more material on top of the cylinder where it meets the head, chances are its a slow cylinder. if the exhaust port height is less than 12mm, its probably a slow cylinder.
if all that stuff is yours and its taking up too much room i'd gladly relieve you of some of it.