Cliff,
You will need to convert the stock generator over to an alternator. Most of the kits have the necessary brackets although you should be able to even use your original bracket if you want to.
The reason for this swap is because the generators put out only about 25-45 amps depending which actual generator your truck is equipped with. I believe the air conditioning systems want at least a 70-amp alternator but check the particular unit spec you purchase.
Good luck with your installation.
