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Yep, should be a case of running new speaker wires if they are not already there.
If you google "Alpine DIN ISO plug diagram" you'll get results like:
Alpine should be standardised and from a very foggy memory that linked diagram looks correct. If the speakers aren't wired there'll be a few inches hanging out the back of the plug that you can strip and connect the speaker cable to.
TRA
The van has an aftermarket alpine head unit, I'll find out what model and Google what I need tomorrow, sounds a lot simpler than I'd thought!