Gear Vendors question

So if Im reading this correctly, You change to a B/E mainshaft ?

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Part # 3DFS833G

188709Manual 4-Speed A833 12″ Tailhousing 30 Spline Output Shaft​

Manual 4-Speed A833 12″ Tailhousing 30 Spline Output Shaft.Replaces 12″ Tailhousing.60’s and 70’s muscle cars.A-body applications require change to B/E-body output shaft, modified GV adapter, and A-body adapter plate.