I'll take a look in my basement collection of legacy mac's and the collection of related CD/DVD's .

Although, you no doubt know this, if you install more then two internal hard drives it may prove beneficial to install an extra internal fan to keep your dual MDD "cool".

I had several dual MDD's and QS's each with four internal hard drives and sometimes would just leave the side doors open to help cool down the interior compartments. The MDD's were as best as i understood had poor heat sinks and required help to keep cool albeit not many user would have more then one internal hard drive and those user's had no idea or worries about the heat problems.