I have an older SC846E1-R900B. The newer version of this chassis, SC846BE16-R920B, has an option for a rear 2-bay 2.5" hdd kit, part number MCP-220-84606-0N. Looks like it fits in the vertical slot where the old chassis had an optical drive. Since both chassis are very similar, I'm curious if the MCP-220-84606-0N will fit? Can anyone confirm? Supermicro's website doesn't officially list this option for my older model 846.