I would search for a 4 pole molex connector.
Where do the wires lead? The smaller one and larger one, 12 pin?
Does the 12 pin lead to the head unit? The 4 pin leads to the speaker and light?
Maybe you can cut them and use different connectors? Need to see more pics.
Google Molex connector kit, car audio and tons will turn up.
4 pole molex
https://www.digikey.com/en/products/detail/molex/0430250400/252497
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