Hi, I’m looking to replace the decals on my 2023 Rockshox Ultimates with the most genuine looking replacements? Mine are metallic silver/chrome. Who sells them at a reasonable cost. Most appear to be pale imitation offer gloss grey, white or silver (which just look like light grey to me

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The metallic/chrome finish is the tricky bit here, and you're right to be frustrated. Most aftermarket decal sellers use standard vinyl which can't replicate that mirror-like chrome effect properly. The ones that come close tend to use a chrome or brushed aluminium vinyl rather than plain silver, but it's genuinely hard to find someone doing it well for RockShox specifically.
A few places worth investigating:
Decal Works (decalworks.com.au) are based in Australia, which isn't far from you in New Zealand, and they do a reasonable range of suspension decals including RockShox. Their metallic finishes are generally better than most European sellers because they use higher-grade 3M chrome vinyl stock.
Ridge Monkey Designs and
Vital MTB Decals both get mentioned on various forums for quality suspension stickers, though their RockShox Ultimate range varies by year model.
For genuine chrome effect specifically, your best bet might actually be a custom vinyl cutter. Any decent sign shop or vehicle wrap specialist can cut custom decals in proper chrome or brushed aluminium vinyl if you supply them with an SVG file of the RockShox logo and lettering. The vinyl itself is the same commercial-grade material that looks genuinely metallic rather than "light grey on a good day." Vector files for most major brands float around on graphics forums without much trouble to find.
Worth checking what year-specific variant you have on the Ultimates, as the font and layout changed slightly between the 2022 and 2023 models, and that's exactly the detail that separates convincing from obviously wrong.