5 card,
Well, aluminum is what you would have gotten based on what you asked for so you seem to be the one confused here. It's fine that you know what you want but that helps no body. You're assuming everyone knows what they have or the difference between alum and steel so until you learn a little more by being here longer you'll know that's not true.
I don't have what you want for sale but if you're here long enough you may learn (or may not learn with your attitude) that people on this forum are not just here to supply parts for you. They are mainly here to try to help all members.
And if you hadn't been too lazy to study Hamm's site that YOU yourself linked to, instead of griping at forum members, you'd know what number to ask for and that's what I gave you above. A description for what you want is not adequate especially since your original description is so bad, it's a perfect example of why! Therefore the numbers w/descriptions were put together on that site in the 1st place.
Good luck, I'm not sure anyone will want to deal with you even if they have what you want, your "smooth" personality has become very clear for all to see.