Matt, I am thinking that I may need to add another one of those kits to my collection to represent a SLSX car. They showed up very frequently in NYC stock trains, along with many other stock cars from midwestern/western roads. These stock cars tended to be routed as far east as Boston and NYC, which is contrary to what I see on many model railroads (primarily home-road stock cars, if any at all).

Jack, I purchased one of these kits earlier this year. The side framing in mine was nickel.

-Phil Lee