The Rolleiflex SL66 hard leather lens cases  were available for 40mm-500mm lenses. They have a back lens cap attached to their inside bottom to secure the lens.

Item # 972 230
for Distagon 40mm
Made from 8/1968 - mid 1991

Item # 972 210
for 50,60,80,120,150mm
Made from 8/1968 - mid 1991

Item # 972 220
for Sonnar 250mm
Made from 8/1968 - mid 1991

Item # 972 240
for Tele Tessar 500mm
Made from 8/68 - mid 1991