You've hit all the right contacts; CSL are the manufacturers and the last contact info I had for them was:
CSL Cams, 53 Bourke Street, Palmerston North. Ph/Fax 06 356 3700.
Email: [email protected]
Supposedly Cylinder Head Specialists in Christchurch make them too.
Perhaps contact our member Gloverman - he might be able to direct you to someone over there.
Did I not get back to you? I have had heaps of enquireys lately. I can get them new fabricated for stock ports and modified ports. Every now and again they come up secondhand over here. Price can be anywhere from about $1200 up to $2000NZ. The guys tend to make a run then wont for a while so supply can be unpredictable.
Have you tried here........?
Or have a go yourself like this guy............