Most aftermarket balancers are neutral balance with bolt-on weights for the external balance motors. So pretty much any aftermarket balancer will work if it has the bolt-on weights (just take them off).
That said,
Fluidampr offers a neutral balance for '71+ with the 'later model' timing cover.
In the question section on that page, Fluidampr states this listing does NOT require spacers/spacing of the damper. Should be bolt-on and go.
