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A 'Fastback' is a 'Commando' [commy?] the original model being known as a 'Commando' from the start of production, 'Fastback' being a nickname it picked up, but later proved useful to distinguish that particular body style from the later 'R' and 'S' (and other) models and so became the officially adopted name.So frame differences are mainly related to production dates rather than model type, all models from a particular production period having the same frame, as far as I am aware.Commando frames generally have their part number stamped on the front face of the left-hand fuel tank mounting bracket (in rather small digits) so that can help to identify a frame as being from a certain production period.Addition------------------I see that you may have asked a similar question (under a different name) on another forum? But there you have included more information about what you actually needed to know - so a Fastback tank and seat kit should fit any 750 frame as far as I know.
A 'Fastback' is a 'Commando' [commy?] the original model being known as a 'Commando' from the start of production, 'Fastback' being a nickname it picked up, but later proved useful to distinguish that particular body style from the later 'R' and 'S' (and other) models and so became the officially adopted name.
So frame differences are mainly related to production dates rather than model type, all models from a particular production period having the same frame, as far as I am aware.
Commando frames generally have their part number stamped on the front face of the left-hand fuel tank mounting bracket (in rather small digits) so that can help to identify a frame as being from a certain production period.
Addition
------------------
I see that you may have asked a similar question (under a different name) on another forum? But there you have included more information about what you actually needed to know - so a Fastback tank and seat kit should fit any 750 frame as far as I know.