What cases fit a Besson New Standard BBb 17 in bell?

[tofu]

The original 41 year old wood case is on its last legs and really beyond rehabilitation. The horn itself is in great shape and I'd like too keep it that way. Not my main axe, but used once a week for one of the bands I'm in. Horn and case stays locked up at our performance center during the week. Would a case for the Yamaha copy of this horn (321?) fit? Any other possibilities? Would prefer a lockable case and fiberglass construction as this band does tour via overland bus and horn rides in the cargo hold.

[aqualung]

I just got a Yamaha YEB-321 case for my B&H Imperial Eb, which is the same horn as the Besson New Standard Eb.