WHITFIELD - ADVANTAGE (WP2) II (Only for models that have the upgraded Nylatron Bearing)
WHITFIELD - ADVANTAGE (WP2) II-T, III, II-T (Only for models that have the upgraded Nylatron Bearing)
WHITFIELD - ADVANTAGE PLUS (WP7)
WHITFIELD - ADVANTAGE OPTIMA 2 & 3
WHITFIELD - CASCADE