My bicycle is old (for sure pre-2003, don't know how much older) and as far as I've read the older models had a steel frame, so I think mine could be the steel kind.
In this one both the "eazy wheels" are to be mounted on the outside of the rack, whilst in the new model one goes in and the other out.
My rack weights 314 grams (just measured with a kitchen scale).
I like the idea to share pictures in the while, so here it is:

Close-up:


Now, I have to consider if I want to get a wire wheel or not. Being sure that it could be used to remove all the old painting and rust from the frame without compromising its solidity, that would be the choice.

Thanks!