Gordon,That first car, is an early transitional spider with many 750 series hold-over features. The other two are later versions, more like yours. Your '60 should have the manual valve, but I do not know when that manual valve bracket appeared. Best bet would be to see if your CHASSIS number is somewhere within the range of those three cars. That is why they are lined up like that. The earliest car, the red one, is different than the other two. Skip has to figure out the progression of updates.
Dave,Should have noted, the water valve bracket was used on 750 -101 Spider veloces with the manual valve. Of course this would be prior to the addition of the cable operated heater valve which I understood to be added in the 1600 Giulia Spider. DaveB