Custom Crank and Water pump Pully's

Im looking to upgrade my HO alternator to a New alternator that has 2 belts instead of one. I now have a single 3/8 inch pully running my alternator. I need to get some new pully's so that the new alternator with 2 belt's can work. I need a new crank shaft pully. My current crank shaft puly has 2 groove's in the pully. I need a new pully with 3 groove's. I also need a water pump pully with 3 groove's. I have been calling around it dosent seem like sutch pully's exist's and I might have to have a new pully turned. Any one have andy ideas where I can have somthing made. Or if this part already around? Its for a Ford PCM 351W LT