NuBus Card Retainer – Power Mac 8100 Quadra 800 840AV $10.00 Secure the Expansion cards NuBus Card Retainer - Power Mac 8100 Quadra 800 840AV quantity Add to cart Shipping QuoteView the quote listContinue Shopping Category: Case & Internal Parts (Macintosh) Tags: nubus, retainer Description Apple 922-0393, 815-1311. NuBus Card Retainer for the Power Mac 8100, WS 8150, Quadra 800 & 840AV