iMac 21.5″ A1311 – Backlight Pressure Wall $5.00 A1311 – Late 2009 – Mid 2010 – Mid 2011 Select One Choose an optionABClear iMac 21.5" A1311 - Backlight Pressure Wall quantity Add to cart Add to Quote Continue Shopping Category: A1311 (21.5" iMac) Late 2009-Late 2011 Description Backlight Pressure Wall – iMac 21.5″ A1311 A) Mid 2009 – Mid 2010 21.5″ – 922-9282 B) Mid 2011 21.5″ – 922-9805