Yes, 220 is five feet, same as 35 mm.

Hmmm. If those are close spaced, like the 220 stainless reels that fit a standard tank or like a 35 mm reel, they probably would (or at least could) fit thirteen feet in the larger Nikor tank. I've seen Nikor tanks sized for a single reel the size of my wide-space 220 reels, too -- I wonder if those weren't originally made for this 70 mm x 13 foot roll? Of course, I'd be looking at 24 ounces of developer to soup a single roll of 116 at that point; I'd save the junk store price of an old plastic adjustable tank just in developer concentrate in 2-3 rolls (not even considering the price of the 70 mm reels).