Agreed under normal circumstances. The 67 brackets are heavy duty compared to the 68 version for non-thermactor vehicles. Likely because of the dual alternator belt drive used on non-AC vehciles. Those are from a non-thermactor vehicle he has. The alternator is in the up position with the brackets, not the lower position. They use different adjuster arms and mounting brackets.
So yes, they will work for your application as stated.