Model A Truck Running Board Question

[BadgerA]

I have what I believe is a set of original 30/31 pick up running boards. I recently compared them against a set of new Rootliebs that a friend purchased for his truck. His new boards appear very similar to mine on the top and side. However, the mounting brackets on the bottom are quite different. Difference in the ends of the brackets and difference in the cut outs for mounting. Can someone confirm which is correct? Perhaps the pictures will make this question clearer. Thanks.