I've been battling the 1977 Hostess set since it originally came out. The problem is the individual cards. There are six different formats in which they were released. Some cards were issued in multiple formats base on the product (Twinkies, Ding Dongs, Cupcakes, Sno Balls etc).
My master collection is close to complete, missing some of the extra wide panels from the high number cards.
You can see the frustration in this thread
http://www.net54baseball.com/showthr...s+case+hostess
That being said, the L shaped panels are not for every panel. Only selected ones. I'll have to check what I have when I get home but I have the run of them from 1976. I haven't tried the later years. Off the top of my head I would say there are maybe a dozen panels that come L shaped. All of the L shaped are also available in straight panels.
I have not noticed either a premium or a markdown for the L Shaped panels. Set collectors hate them because they break up the symmetry.