Belt part# using u/d crank and water pump pulley with OEM ALT??

Guys.....

1st...i did do a search but couldn't find what i'm looking for..

I replaced my crank and water pump pulley, but I want to keep the stock alt. pulley. I know I need a shorter belt now. Does anyone know a part # for the belt I'll now need? OR do you know the length of the shorter belt?

Thanks...hopefully I can get the car out this weekend!! The weather is finally getting better here in Jersey...

Mine is def. slipping. the tensioner is at its lowest postion, & The ALT dash light flashes intermittantly :damnit: