Great news is that Cornelius brand ball lock and pin lock keg posts are interchangeable with the Type B ball lock posts found on this site. Found this out after below..._x000D__x000D_I purchased these before Midwest specified "Firestone" in their description, and was quite disappointed when I found this out as I was trying to rack into the keg! I'm sure they work great for Firestone kegs if you need to convert, but are a little pricey for being aluminum and not SS. Two Type B SS ball lock posts are cheaper than these, and a much better quality. I was very happy to find out Cornelius ball lock and pin lock posts are interchangeable.