Hi Dave, if you are still looking we have our Michigan Apollo propellers available in stock in Devon, in a 19" pitch with a compatible hub kit for a Mercruiser Alpha One - these are brand new Stainless Steel props, part numbers 993044 (RH) and 993054 (LH) and are £216 each + VAT and carriage (£10 for the pair and a hub kits). The hub kit would be part number 202, and these are £28.43 + VAT. You can see a bit about these props here:
Apollo : Apollo 3 Blade
I hope it is OK for the company to post in this forum, couldn't see any rules against it but would of course be good if it wasn't allowed!
Tom, MMP