olds 307 belt to replace ac and correct sqeek

[Silent viewer]

i have a 85 riviera with a olds 307 that has the belt sqeek that seems to be common. the ac was removed from the car and i think that that missing second belt from the crank to the water pump is what is causing it. i remember reading in the past that people fix this by running a short belt from the crank to the water pump only. does anyone happen to know the size or number for that belt?