Fan belts #2

[RPOLS3]

Seeing Tommy's post on Day 2 fan belts reminded me to ask - is there any other source for non cogged original "Day 1" fan belts anymore other than Quanta?

I am not having very good luck with their alternator belt for the Chevelle, specifically it won't stay on after some spirited driving, even after switching to a deep groove alt. pulley. Really don't care for the look of a top or bottom cog belt but it is the only thing I can find that right now will stay on........

Thanks

Jake