HITACHI TECH SAYS 8000 IS MAXIMUM RPM'S. DEPENDING HOW TERMINALS ARE HOOKED UP, THIS WILL WORK AS EITHER CW OR CCW. ALL HITACHI MOTOR GENS ARE THIS WAY. PIVOT EAR HOLE SIZE 9mm SPACER MUST BE 9.5-10mm THICK PULLEY THICKNESS 17.74 mm FOR ARMATURE, ASK CUSTOMER WHAT THE LENGTH IS OF THEIRS 32-295 (8.5" LENGTH) OR 32-299 (8.75") 15435N SAME BUT 13MM MOUNTING HOLES