.. that can take two different sizes of bass instrument? I've tried the MONO case (the one who can take two electric basses), but I want one that can take a Dingwall 37 inch scale length in the first slot and a 34 " headless graphite Steinberger type (fretless) in the other slot. I think all neck support will be wrong inside, and leaves too much space up at the headstock, or where there used to be a headstock. Does anyone know if this is possible with any of these gig bags? I do have e-mailed MONO cases. They say "right now" it isn't possible, but hinted at that they're working on something that eventuall turns out - kind of - modular inside, i e that you can move stuff around, so the velcro strips and neck support adjusts to your instrument. Since it's not just about headless, but say any short scale bass too, and up to long scale. I know that Dingwall Combustion will fit in a regular Fender P or J gigbag anyway, so that part is already taken care of. Anyone knows if such things exists?