I also have a 1985 300D in Canada. I searched through EPC, but couldn't find that bracket that holds the torpedo shaped connector plus one other.Not to say it isn't there though. On mine the torpedo part is fine but one half of the outer clips that hold the rectangular connector have broken (I moved it out of the way). But all you need, is a couple of tie-wraps to hold it there.
The clips that go onto the injection pipes are I think shown in EPC section 7.105 (injector pump) You would need a pair of 3120780285 plus bolt (N304017005002) and nut (N000934005008).
The extension clip that seems to be for a cable is shown greyed out meaning it is not used on my 85. It is there, but not used on my engine. Again, if you just want to attach a cable, tie-wraps work fine! Or you could bend a piece of metal and make the clip.
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5