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I believe that the dates for the IDS were 67 and 68. The IDT was Euro 911T, only. The IDTP was used on the 69 US 911T and (I'm not as sure) the 914-6. IDTP was an emission control version of the IDT.
Paul Abbott has a wonderful explanation of Webers at performanceoriented.com. It is must reading for anyone who has them.
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