As far as I'm aware the HRC kit is just a rear head, a fancy hose and maybe a short plug and a coil with the short plug cap attached.
The part number is 06113-NKD-970.

Apex list them at £96 which is cheaper than the combined price of all the parts required if you bear in mind they say you do get a coil.

Jamie also lists them but without the plug+cap+coil and has a nice pic of the hose required as well.
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