I don't remember if there's sufficient front/aft "wiggle room". Theo at Rugged Outbound Supply should have better answers; you can contact him at info@ruggedbound.com through their website. He is very knowledgable and helped me out when I was buying and installing the drawers.
Sorry to be so late, but I just saw this. We moved from Nebraska to Tennessee in December, so I didn't log on. I saw you got your drawers installed. Nice!
Installed my Rugged Bound drawers today. Very impressed with the system and the order process. Theo from @RuggedBound was great to work with; he kept me in the loop with the shipping and even had time for a couple of goofy questions. After taking the third row out, I put down a layer of...