Our Harpoon has two Warren MacArthur seats one each at the radio and radar ops position. The same basic seat can be seen in many other aircraft even the P-61.
The office chair seat in the B-17 were also used in the B-29 at the nav, radio and radar ops position usually with slightly different variations on the lower tubular mounts. Some fixed, some had rollers and could slide on tracks. The B-17 bombardiers seat has a real stretched version to mount over the chin turret but the mounting post and above are all about the same seat.
Here is a shot shamelessly stolen from
http://ships.bouwman.com/B17/Chin-Turret.jpgMay have some artistic license but you get the idea.

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Thank you!
Taigh Ramey
Vintage Aircraft, Stockton, California
http://www.twinbeech.com'KEEP ‘EM FLYING…FOR HISTORY!'