Assuming the filter you are referring to is the touch control, my parts book shows a part number of 351 984 R92 for both early and late touch control systems.
The zerk allows you to pump grease in behind the graphite block, where the oil in the grease slowly seeps through the porous graphite.
Regarding the pressure plate fingers, they are adjustable on the Rockford (most common clutch). Also the amount of travel on the throwout bearing is adjustable by loosening a bolt on the clutch pedal (most models) or by an adjustment on the rod itself (very early models). You would save yourself a lot of headaches by getting a service manual either from your local dealer, or from http://www.binderbooks.com
Regarding the blade go to Rudi's manual sever at http://www.cleancomputes.com/Cub/index.html
and go to the implements, then to the grader and leveling blade.