2.5 engine balancing

[105gta]

Hi everyone. I'm after a little information if anyone can help. I need to balance a 156 2.5 v6 crank assembly to a new flywheel, I need to find out the piston,pin and ring assembly weight for this to happen. Unfortunately I only have a complete engine that I'd rather not pull the heads off just to weigh one piston and ring set.
If anyone happens to have one lying around they could weigh for me or maybe know the weights from a previous balancing exercise. It would be really appreciated.
Thanks Ben