Power Mac 8100, 8150 – Expansion Port Cover $10.00 Slot covers for the empty expansion card bays. Power Mac 8100, 8150 - Expansion Port Cover quantity Add to cart Add to Quote Continue Shopping Category: Power Mac 8100-8500 Quadra 800 Description Expansion Port Cover, Power Mac 8100, 8150. These are a little bit oxidized looking but will still work nicely.