Chassis Brace – Power Mac 8100 Quadra 800 840AV Apple Rescue of Denver » Products Page » Macintosh to PowerPC » Case & Internal Parts (Macintosh) » Chassis Brace - Power Mac 8100 Quadra 800 840AV Power Supply Brace Apple 922-0396, 815-1421. Chassis or Power Supply Brace for the Power Mac 8100, WS 8150, Quadra 800 & 840AV. Product in stock Price: $5.00 Updating cart... Updating...