In the upper right of this page there is a search window; not the browser one right at the top another one that just searchs CNCzone.
Put 'Haas Servo 300 bar feeder' in this window and you will find dozens of posts that mention this bar feeder. You should be able to find what you need somewhere in these posts.
EDIT: You have to scroll to the top of the page to see the search window I mean. It is not visible when you are reading this post.
An open mind is a virtue...so long as all the common sense has not leaked out.