Centris 610 ~ Power Mac 6100 – Expansion Port Cover $8.50 When port is not in use. Centris 610 ~ Power Mac 6100 - Expansion Port Cover quantity Add to cart Add to Quote Continue Shopping Category: Centris 610 - Power Mac 6100 Description Expansion Port Cover assembly fits all Centris / Quadra 610 / 660 models, Performa 611x Series, Power Macintosh 6100 Series and Workgroup 6150 Series. Apple number 922-0902. Assembly includes cover and shield.