There are too many styles of Sheaffer feeds to count. Here is what we've measured, listed and have in stock for you. Please read through the dimensions to decide what you need. We do not know what feed goes in what pen (unless it's listed with the dimensions given). You will need to decide what feed you need yourself from the information we've provided. *Note: you may need to drill out the old, broken fill tube from the back of the feed, as these are not all NOS.