I broke the Fan/alt belt today - what are you using on your car?

Shop that built my engine really likes Dayco Top Cog belts. I think the number was 15440 but not 100%.
15 is .440 width, then your length-440 = 44" such a 15460= 46" , add a 5 for 1/2" increments 15, 15465 = 46.5" and so on