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Even though the cover has more room than some other covers, it's still a difficult fit. See the picture below for how it fits on my MK3. Yes, one of the wires has quite a sharp bend. Remember though that that's a one-time, non-repetitive bend, and should not be a problem. Also, others who have made this part report that flipping the connectors over allow them to be angled in such a way that there is less bend required to get the cable to fit.

Making the neck of the top part longer longer would (help).

Perhaps, but I found that making the neck longer puts the cable under tension.