The authentic Bigsby B5G is a gilded vibrato / tremolo tailpiece that's been specially made for solid-body guitars with a flat top.
The Bigsby B5 - here with an aluminium-coloured finish - is a Vibrato (tremolo) tailpiece for solid-body guitars with a flat top.
You can use the Bigsby B7 Vibrato tremolo tailpiece for solid-body guitars with an arched top. This is the aluminium-coloured version.
The Bigsby B30 Vibrato is modelled after the original Bigsby B-3, suitable for thinner hollow-body and semi-hollow-body guitar types. This is the aluminium-coloured version.
The Bigsby B50 is the cheapest version of the Bigsby B-5, designed for solid-body guitars with a flat top. This is the aluminium-coloured model.
The Bigsby B70 (aluminium) is the right choice for those who are looking for a friendlier-priced version of the Bigsby B-7. The B-70 is suited for a solid-body guitar with an arched top.