General BIG BELT UPGRADE

I have gob 700 comp, just ordered everything that I thought I needed to complete the upgrade.
turns out that the secondary shaft is to short to install the double one way pulley.
any goblin owners out there with the big belt upgrade on there heli that could send me in the right direction for the right shaft. Or maybe could it be the main frame support that is not correct.?
 
thx smoggie, I went to sab golin web site , looked at all the diagrams and manuals but could not determine if that shaft was actually longer or not. I knew one of the homies here would know
 
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