Bill, 8 mm film nomenclature confuses everyone. Single 8 is Fuji's riposte to Super 8; same gauge and format as Super 8 in a cassette with separate feed and take-up spools, can be spliced with Super 8.
For those who don't know, 8/8's camera gate is ~ 3.5 mm x ~ 4.8 mm. Tiny. Super 8's (and Single 8) is ~ 4.2 x ~ 5.8. Not quite so tiny. Kodak's disc camera (8 x 11) is said to have failed in the market because of limited enlargeability.