Darrell Groat, from Moose Racing, Euroa, is the Hagon shocks distributor, but also races a Hagon Yamaha monocoque, in fact I think he's the current national champ in P5 500 : he also used to work assembling the things in the Hagon factory, so he'd be able to offer a clue re the numbers produced.
Website
http://www.hagonoz.com.au/Email HagonOz.com.au
I first spotted his bike when he slipped past me diving down through the esses in practice at the Southern Classic at Broadford a couple of years ago : I said, "Ooh, a Hagon !" and then bloody near missed the apex into the second ess...