I e-mailed K-MAC in Australia regarding costs etc for their RARB given how much better the fitting kit etc looks for them compared to the Whiteline ones. They came back with this reply (for reference really!):
"Yes we do get good feedback re our bars (K-MAC manufacture the worlds largest range and is the original aftermarket manufacture of front and rear bars back in 1964 )
Currently are in process of updating the Astra design to tubular
Less weight plus air freight costs reduced by half
Envisage production by 2nd week in December"
No idea on price but I'll get back to them mid-December to see what they can offer.