Swartz Ink Products-"Package of Three" Olivetti Lettera 21, 25, 31, 32, 35, 36, 36C, 82 and S14 Typewriter Ribbon, Compatible, Black Black Nylon Ribbon 2" Spool 1/2" Ribbon Package of Three The ribbons that Swartz Ink sells for this typewriter have a larger center hole, so the ribbon spool holder fits and screws onto the spindle.