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I don't think you can get the 4 bladed aluminum Spitfire (or Quicksilver Nemesis) in 21" pitch for a mid size gearcase. But if you can, that is what I would buy. Otherwise the 21" Black Max (Quicksilver Black Diamond) would be the one to buy.

https://www.mercurymarine.com/en/us/p.../spitfire/

See the video links for more info.

Walmart on-line has the 21" pitch Black Diamond for $79.50 shipped!