We used a Bubble Balancer (http://www.northerntool.com/shop/too...4379_200514379)
when I worked on Nix's Silver Crown car.

And these weights: http://www.oreillyauto.com/site/c/de...eyword=+300360

We covered the weights with duct tape for insurance.

Watch for interference between weights & brake caliper!

steiny