I installed another 145 amp alternator on my 2007 classic (dual alts), lbz and the belt i put on was part number 97300655. Belt was a bear to go on and i was wandering if the belt number 97300657 is longer. i thought the 57 belt might be a little longer and would go on easier. the 9730057 number is for dual alts california emissions. 9730055 is for dual belts fed emissions. Mine is fed emissions. any help would be appreciated

Hi A belt at this time is not going to happen.
The case is large and makes the belt to short.
Solved with 2 105 amp or 2 145 amp with the same size case as the 105 amp has.
I just went through this with frank at pitstop motorsports and he helped over and beyond any company i have ever worked with.
Randy

update:
the 07300657 is the belt to use for dual 145 alts. it is 22 mm longer than the 07360055 for the dual 105's.
can be purchased at gmpartsdirect.com