Yokomo YZ2 Weights

[Whoopner]

Today i used my YZ2 for the first time and was always gonna be hard as it was outdoors on a lovely wet astroturf track. Im surprised how well it drove but def feel it needs some weight in the back. I can't seem to find stock anywhere for the rear brass suspension mounts. But can see the steel ones in stock at most places. Does anyone know the weight of the steel versions compared to the brass?

Or can anyone recommend where to get a decent set of rear weights for this car?

Thanks

Matt