the gunmetal are a very curious colour. if you shine light on them then they appear bronze. but other times they look like normal gunmetal and others look lighter.
i bought my 18x8 gravels from troy...... however it would appear that he (like rota australia) only brought in 18x8.5 wheels. you can get 18x8 gravels from wheeldude.com i ordered a spare from there and they sell the set for $899US. however for 1 wheel shipped it was $180 just for shipping. it was $400 landed.