There are several kits available for a GM alt upgrade.  Trail Tough, Roadless Gear and Petroworks are amoung a few vendors who carry them....
You can get a bit fancy and get creative with the top bracket, but usually the original one will do........

Here's a pic one of the first brackets I made from a go-Kart tie  rod....

Wow that looks awesome! So clean!  

 :)I had nothing but problems with alt its self went through 3 probable cause gm alt not ment to spin at rpms that most suzuki owners run.    Iwas told  by an auto electric shop(thatitrust)touse dual battery set . comparale price and works.                              

:)I had nothing but problems with alt its self went through 3 probable cause gm alt not ment to spin at rpms that most suzuki owners run.    Iwas told  by an auto electric shop(thatitrust)touse dual battery set . comparale price and works.                              

Not sure why you had such bad luck unless they were rebuilds using old parts(regulator, diode trio, rotor, ect.).
I had no problems since I put the 100amp one on. I run dual red tops and by doing so they may last longer with winching but when they get low on power, it will take longer to get them up to par than if I had one. This may be to stressful for a stock alternator to recharge 2 batteries. For that reason I wouldn't run dual battery with a stock alternator.

   hey man just my experience since dual battery. weight has become issue (2800lbs ) got rid of dual battery went with stock alt for track/kick and use one blue top  run winch 2 piaa lights 4 rock lights acc head lights hearter and on board compressor no prob

 hey man just my experience since dual battery. weight has become issue (2800lbs ) got rid of dual battery went with stock alt for track/kick and use one blue top  run winch 2 piaa lights 4 rock lights acc head lights hearter and on board compressor no prob

No problem, experiences are what forums are all about. I just couldn't stand all the accesories dieing down at an idle in my stock sami, that's why I went with the GM style. Plus I have an onboard welder waiting to be installed which uses an unregulated GM alternator for power. If your looking for any ideas for onboard air using your stock a/c compressor let me know. I have a 2.5gal tank and 160psi at a flick of a switch. It's one less electrical item to worry about.