These products are ONLY compatible with QuickBooks/Quicken software. They will not work with the ACS software8 3/4 X 3 9/16Double Window Envelope/ChecksUpper Window: 3 1/2 x 7/8• 3/8 from left• 2 1/4 from bottomLower Window: 3 1/2 x 7/8• 7/8 from left• 11/16 from bottom