Yeah that setup doesn't look right. Looks like its a NA rotor (282x20.4mm) with turbo caliper intended for 298x28mm rotor. No beuno to use a 28mm caliper on 20.4mm. You should inquire on the details of the advertised setup.
To fit 15s, you COULD turn down the OD of the turbo rotor to make it fit a 15, but it's a pain since the rotor is not off the shelf and replacement parts will require modification.
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