Rocky, Yes, in fact the attached references say that the Jensen Mk3 used the same Girling 17/3 front and 12/3 rear (same, meaning the same casting as used for years on Lambo/Maserati and Mangusta). Volvo P1800 also used Girling 17/3, but these are a different casting (and may be a different center, I suppose 3.0" instead of 3.5"). The picture you show for the rears shows the spacer used with the ventilated disk (as used for later Maserati).
So many cars used these brakes, still (when the cars were Lambo, Iso Grifo, and Maserati!) only the service parts (rebuild kits and pistons) grow on trees...Lee
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