#8895 NAPA Window sign NAPA was founded in 1925 to meet the United States' growing need for an auto parts distribution system. It is a retailers' cooperative that distributes parts to both corporately and independently owned auto parts stores. There are over 6,000 NAPA stores. The window sign comes on an over sized clear background that can be trimmed as small as .8 wide x 0.5" tall. Sign comes with a 3 position switch: flashing-off-all on.