Where's the best place to buy a PRT?

I want to change the thermostat in my Mk1 MGF for the PRT setup found in later models. Where's the best place to buy the parts? Ebay has lots of cheap looking "Freelander thermostats". The housing looks like the PRT. Are they any good? What about hoses? Is it best to buy just the PRT or the whole sh-bang?



BTW. I live in NZ, so friendly shipping arrangements would be good.

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