I just fixed this on the website. Price is $4.38 for 1 pair. These are non-adhesive 8 mil static cling vinyl. So far confirmed to fit Stern, Spooky, Williams/Bally... pretty much anything that has the flipper button mounted in the cabinet and not the side-rails like Gottlieb or older Bally & Williams.
https://www.titanpinball.com/index.php?route=product/product&product_id=138