When repalcement parts are needed for custom windows and doors it's important to have the original ordering information. For products shipped before April 6, 2009 look for the manufacturers date on the glass usually in the lower right corner of the window or door. Mouse over the magnafing glass to see a close up. The example below shows a manufacturers datae of the 2nd quarter of 2004.

The manufacturers date is the last line and shows the quarter and year the product was made.