D409 Distributor Rotor Question

[jeff68]

Is it typical for a distributor rotor to have a steel bar instead of brass?  By bar, I mean the radial bar on the rotor that transmits electricity to the contacts inside the distributor cap.

Background:   I have a Delco rotor with a brass bar, but it is the shorter "E" stamped version.  I want to use a rotor with the longer bar, so I picked up two different old aftermarket rotors.  They both have the longer bar, but it is a steel bar that is plated to look like brass.  I'm worried that these won't work as well as a brass bar.  The car doesn't get driven much and I think the steel bar may end up rusting at the tip of the bar.