I agree with Reel. The guys that sell props and test props should get you the right one the first time. Ken at Prop Gods in Florida can help. He sent me a prop that I could test before purchase. It arrived new in the box and worked great on my rig so I bought it. If the test prop does not suit you you take the undamaged prop and box it back up and send it back. It costs but not like a new prop. If you like the prop you are not obligated to buy his prop but his prices were reasonable. You may find someone closer to you that offers the same service. Boat yards used to help.