When upgrading from a 10MT to PG/Mini Hi-Torque starters you are reducing the size and weight of the starter by roughly half. In these instances you need to add the conversion bolts to your purchase.
There is no real rhyme or reason to determine if you need these by Serial, Make or Model. It has everything to do with the bolt pattern and if you know what you have and what you are getting.
If you are still unsure, give us a call at 586-257-1515!
It is cheaper to add the bolts onto your order at the time of purchase than to realize you need them and order them separately!
Note: these are not standard bolts that you can purchase at a hardware store!