I think I have it - in the UK, the Kilauea was offered only with P2s for 1997, but for the North American market there was also a Kilauea SE model, fitted with (guess what?) Z2s and in a colour called Plum Blue. And whatever plum blue means it was presumably different from Matte Blue (Kilauea) or they wouldn't have bothered to give it a different name. And indeed it looks as though this is the original paint and they chose it to be colour-keyed to the Z2 fork. The Kilauea was $US1,049 and the Kilauea SE was $US1,399.
So this may well be the only Kilauea SE in New Zealand!
Interestingly, the 97 Explosif was $US1,649 with an Indy SL fork - which is the better bike of the two I wonder? The more-expensive one with a hopeless fork or the less-expensive one with a lighter frame and an all-time classic fork?