harmonic balancer - damper

If you do get the aftermarket balancer, the weight descriptions are screwed up too. You just need reason out which weight to use. If I remember correctly:

Neutral balance for anything including Magnum 5.2 engines use no weight.

The external balance 340 uses the lightest weight.

The Magnum 5.9 uses the middle weight.

The LA 360 uses the heaviest weight.