PRW SFI BAlancer P/N 2431841 which balance weight.

Help. I just got my new PRW balancer in and ready to install it on my magnum 360 engine. The snag I have ran into is the balancer comes with 3 diffrent weights. Of course the way my luck goes, the instructions don't say crap about which weight is used on which engine. There is a large weight,a middle sized weight and a small weight. THE middle weight was already installed when I opened the box. The only weight I can see any numbers on is the large weight. Which is GW012-1. So I am unsure which weight goes with what engine. Any body else run into this problem?

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