LG Super-Multi Drive Mac Pro Kit / 16X 5.25" Internal Blu-ray/DVD/CD Writer / Complete Kit for 2006-2012 Mac Pro models
$40 cash only
Brand new, never used or installed; purchased from OWC (www.macsales.com) for an upgrade that I never performed. Comes with complete drive and OWC installation instructions for a Mac Pro, but drive could be mounted into an external housing if wanted.
Full specifications at macsales.com here: https://eshop.macsales.com/item/LG/WH16NS40MP/
Currently sells for $65 -- my mistake is your gain.