Jackaroo 3.2 V6 alternator Upgrade

As the tittle says, I'm just trying to do some research for alternator upgrade for jackaroo 3.2 V6, Ive not had much luck on goggle and Ive been trying to sift through the forums but i thought others must of done this so i thought ill ask and see if any one can point me in the right direction would like a little more then 70 to 75 amps.

Thanks Shane