Tyga do a blanking plate for the hole left by the oil pump, but not sure they do the plug for the oil feed hole, which you will also need to fill.

The Tyga blanking plate is IMHO a better, more secure solution than the HRC one.

The small oil feed plug can be obtained from Apex Leisure over here, where I got mine and the part numbers for the HRC bits are:

Blanking plate/plug - 91201-NH3-003
Cone plug - 90807-NKD-940
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NSR300R - Why did i ever have a 250...