Does this sound like a good deal?
You would use the SD3 hub. The 12 pitch that you are running is right in between what we make. We run odd number pitches. We have an 11, which will give you slightly better low end, and slow you down a little. The 13 will give you a little more top end. It will be hard to notice the difference between what you are running, and one of ours, as the pitches are so close. The difference would be more noticeable if you ran both of ours. You can get the props (hub and three blades) for $115.00. The Propulsion Kit (the hub, two sets of blades, the propwrench and the gearbag) is $177.00. This is the most cost effective option, and since you get two sets of blades, you can try both the 11 and the 13 if you chose. Once you decide which pitch you prefer, you can exchange the set you wont use for a spare set of what you are keeping.
This is for an older Susuki 20hp 2cyl motor.