This is a replacement Mac Clutch only. We will include all necessary consumable parts and some grease along with the Clutch. You will likely need circlip pliers and possibly a gear puller to replace the clutch.
The new version Mac clutch requires the gears to be slightly different from the original gear design so if you require the new version clutch, you should also order gears to ensure they can function well together. Gears supplied after approx March 2013 should be compatible with the new version clutch. Make a comment at checkout regarding clutch version.