Throwing pulley/alternator belt

My stock crank is 6 or 6.5 dia.

Alt is 2.5 to 2.75
This little 5 Inch is the one I have sitting on a shelf somewhere. Idle charging was too low for my liking, For anyone's reference.

Moroso 64700: Crankshaft Pulley Pre-1972 Chrysler 340-440 - JEGS High Performance