Where was the cut made - i.e., where would the cut bunch of wires be sitting in the car when installed?
If it is a convenient spot/if there is room for a plug, Phil's comment above, "Alternatively, have you thought about using a pair of 10x multiplugs?" is one to consider.
Check Amphenol, Molex, and maybe some of the electronics supply houses (Mouser, Digikey, etc.). Just make sure the plug is rated for the current needed. Those are not low current circuits.
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