Kitchen Sink Mixer recommendation

[king1]

you could try posting a job on Builders Crack, with a couple of photos of the sink mixer perhaps, that way the plumbers will know what they are dealing with and can probably give you a price for doing the job...
https://builderscrack.co.nz/trades/plumbers

What type is it, Single Lever or a faucet? Both types usually have a replaceable headworks as well...