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I need a gig bag for my Cerveny/Walter Sear BBb. 40 in long, 15 in bell. Would a Miraphone be good or are those made for bigger bells?

My Sear has a Tuxedo gig bag that fits it just fine. I don't remember the exact model number... I also have a Protec Platinum that fits it fairly well. You might see if you can find one of those that you can "try on".

Does tuxedo still make tuba bags?

I couldn't tell you, this is an older bag, don't remember what year I got it. My Sear is in the shop having an overhaul done on it otherwise I'd check and see if it fits the protec bag. I'm fairly certain it does...