The stock one will work, but the aftermarket ones are easier to put on and take off. I also agree with rico, instead of the pivot works set, just get a new billet carrier. Check around, you might be able to find one cheap. That grease zerk is very nice.
99 440ex
Ross 440; 11:1, Hotcam stg. 2, Mild port and polish, Doug Eichner Edelbrock carb,Se7en Racing oil tank, FMF Powerbomb pipe w/ T4 silencer, AC racing front bumper, front Elka triple rates w/piggybacks, Elka revalve and zps resprung rear, Home made T-pin front suspension, Roll Design pegs w/ kickups, DG nerfs, Burgard Carrier, Lonestar Axle, Alloy Specialties axle nut, Gusseted frame