Problem is, there are several Bart soapbars with proportions that are almost the same but have different measurements. For example the BB4CBC-B mentioned above is 3.46" x 1.42" while their T4CBC-B ("old Thunderbird") is 3.63" x 1.55" and their M4 series are 3.5" x 1.5". Any of them would work visually but I wouldn't want to order one assuming it's a drop-in fit without measuring first.