Balancer

I may have misunderstood what you were saying. When you say 2 piece balancer is this what you mean?

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This is the one I currently have.
Yes, that's what I meant- the early ones had separate balancers and pullies, later ones were a single piece.
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Your LA pullies should bolt on, depending on their original year they may need 1 hole elongated, no biggie- just takes a minute or two with a rat-tail file.