^^^
i think he went with the biggest OEM option he could. anything bigger might require modification or some type of bracketry.
this is really weird. This sounds too obvious, but make sure your alternator cooling duct is in tact, if it isn't, then your alternator will overheat because of all of this stress and it will blow.
my advice would be looking into this problem more thoroughly, i don't see why you should be blowing alternators like this.
and hopefully that new alt. had a warranty, it's only been like a month.