Super-stamps are created centered on NGC 6819 and NGC 6791 by tiling custom apertures to form a 200x200 pixel block centered on each cluster. These Custom Aperture Files for the open clusters all have Investigation ID that begin with "STC" and are assigned Kepler IDs > 100,000,000. You can find a list of them on the MAST Search Form
by entering "STC" in the Investigation ID box and "> 100000000" in the Kepler ID box. From there, you can select the subset that contains your targets of interest based on the central RA and DECs.