Balancer replacement question

I am getting ready to order a new SFI Balancer . It seems that the new SFI Balancers are much thicker then my OEM one I have witch is just under an inch most are 1.5 " in the fluid dampers or SFI . My pulley will be off 1/2" from my alternator. Do I need to remount the alternator or are there other options like off set pulleys?

Thanks