120amp Denso alt with v belt

my local parts store can't help me. I have a 90 amp Denso that I used for mock up, now that I know it will fit I want to go to the 120 ( I'm sure 90 will be ok but hey what the hell). They can't find a 120 with v belt, only serpentine. Is there such a thing or do I have to go with 120 and change pulley ?