Tom,

I have a Domino throttle. Problem is that it doesn't accept the standard NX5 cable.

NX5 throttle housing is NLA. Have you looked at TZ 5KE/4DP? They look pretty close to me.. DTR have them on ebay, but I'm sure there will be other folks who stock them. I'll probably be going that route next time I need one.
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If it ain't broke, fix it until it is.