i have two diff. stocks that i carry around with me..each a full set… one in B and one in D. both by Childress so they each fit in the same cup…works really well, though i did buy both as full sets so i have an extra set of bellows and an extra bag laying around somewhere.
works great though. like eskin i at one time had little brass extenders to bring my d drones down to b to go with my b chanter… worked fine though since the drones were concert pitch not narrow, they were a bit loud… like strapping on a harley davidson set in B rather than d.