hmm, any idea how close to the same dimensions they have to be?
Regular Drums(closest i could find to the same spec) Bell Shaped Drum dimensions
11.42 in OD 11.56 in OD
Height 3.68in 3.69 in
10.00 ID 10.05 ID
Max Diameter: 10.06 10.09
Friction Surface: 2.90in 3.25 in
Hub Reg: 2.81 in 2.81
Bolt size: .64 in .64 in
Friction surface is wider... from 2.9" to 3.25"... that will require deeper drums for the 3.25" width.....