Since so many Legacy steamers have this "pin", why not call Lionel repair service and ask for a couple? Or, find someone who repairs Legacy steamers for a living, and call and ask him where he gets them?
In my experience, for something like this, many folks would just put two or three in an envelope and mail them to you for free.
I don't think that you are going to have much luck searching through parts lists.
You could make a pin out of brass rod, but it may just wear through at the flatten overlap points where you peened it.
Probably two hours on the phone will get you the pins, if you call enough people. :-)
Mannyrock
