I've been away from DEC stuff far too long, so I don't remember what this is called - but I'll describe it. The beige dec cabinets (corp cab?) that are wider than about 19 inches... the ones where there is the "normal" 19" rack and then to the left or the right there is a top to bottom, front to back, "plenum" about maybe 8 inches wide. What I have is the brown cover for that plenum. 52.5 tall, 7.5 wide, hex key quick-release at the top, two ears at the bottom. Come to think of it, I'm not 100% sure it is from a DEC cabinet but I am thinking it came off one of a few five foot tall beige dec racks all stuffed top to bottom with RA81's. Anywho, whatever it is from, I am sure I do not have the rack (nor the RA81's that came with) that it goes with any longer. I'm in a rather non-trivial project to clean out and organize the basement and I'd like to get rid of this. I'd hate to put it in the skip if someone looks at it as "the last unobtainium piece to finish off their restoration". If no one wants it, I'm going to snag the hex key quick-release mech for myself and pitch the rest. J