Alternator belt too long?!?

Ya I searched and found only one thread on this topic but no one gave him any help and I’m in a similar boat.

I have a b18c1 block, LS alternator and a b16 underdrive pulley. I bought a 91 LS alternator belt and it’s way too long. I just got a 94 gsr belt it’s a smidge smaller than the ls but it’s still too long. anyone have any suggestions??