water pump pulley

Andy F. , YELLOW ROSE , DO U KNOW OF A "SINGLE" BELT WATER PUMP PULLEY THAT IS SMALLER THAN THE APPROXIMATE 7'' big block pulley ?? I`d like to speed my water pump up a hair w/o changing the stock alt. and crank pulleys.
thanks in advance--------------bob
(can`t seem to keep my fingers off the cap button) disregard them---------