I'm fairly sure that in the current climate if you were to stick a "Wanted" advert on the forums - Xpower - .org etc for a ZS180 Mk2 as a swap - you'd get a taker.
You could also list the Fiesta on pistonheads as it's free - and mention that you're after a ZS in PX.
Another option - and I've done this - is simply to email everyone selling their ZS180 on the aforementioned forums offering yours as a swap. If it was me selling - I'd rip your hand off even if only to sell the fiesta on as it'd sell more easily than the ZS.
Just my tuppence worth - Oh and the dealer must be a knob not to go for your Fiesta if they value it higher than the ZS.
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