Coolant take off stubs?

[Billing]

Hi all,

I want to modify an NC30's stock waterpump housing to 'HRC' spec, that is to say that it has provision for fitting to a water jacket style oil cooler. I have a genuine HRC one on the way, but am not too sure what part to buy, it's the little stubs that the hose will go on that I'm after, I'll get the pipe I/D when it arrives, but it's quite small.

Any help appreciated as ever
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
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