Dimension of this product for use on double front entry door with center style.

What is the width of the adhesive side of this product? I am replacng all the seals around my front doors. I have a double front door with a center style attached to the fixed panel of the door. The current seal is the standard compression type of seal but is attached with adhesive as opposed to the standard "groove type" that you would usually find on normal jams. I have only 1/2 inch flange to adhere to. These door were manufactured by Peachtree and installed in 1967. Thank you for your help