shoebox, you know the number?
anyone. i broke one and while the car is in storage, i bought a bolt and washer from Ace for the time being but want to go ahead and replace all 3 of them now

 

crank pulley bolts 7/16-14 x .88 GM # 9442448 is what the book says. Seems odd though, the pricing between those bolts and the crank bolt makes it look like the part numbers might be reversed between the two. You might verify that number with a parts counter before ordering.