I am using the Hirobo u/c on my Alliance. It is not curved but is swept back, I actually prefer the look of it to the ZN u/c I had on before it and also gives more ground clearance and is stronger (useful for flying off less than perfect grass!). It comes painted in the mold in a fine metallic silver which will complement most colour schemes (but does have an exposed section of carbon to prove it is what is says it is!)

I am unfamiliar with the US distributers so cannot suggest a source but I would thoroughly recommend the product.

James