These are used at the back of a Macintosh II where the NuBus slots are. The plastic cover affixes on the exterior while the metal component affixed at the inside of the NuBus opening.
Part Numbers:
plastic cover: 815-6231
metal bracket: 805-5064
How's $25 and free shipping?
We have several sets, message me for quote if interested in more sets (provide your zip code). "More you buy, the less they are!"
Wayne
"Welcome to Macintosh" movie, the Collector