belt size question

[birdman]

im going to put my udp on and looked at the autoparts store for the stock belt size and they have a 73-1/2 and 72-1/2. now do i need one thats one inch smaller than the 72-1/2 or do i just get the the 72-1/2? thanks.

[19Cutlass94]

stock size is 73.5" get the 72.5" with your ud pulley

[birdman]

thanks