Rosso Nuvola (known as Miro Red in the UK) was an option like any other, just the most expensive. Here's a good link posted by rs200 from a thread on the subject that has 156 GTA brochures.
156 GTA-documentation
The ticking, if it's a constant fast clock sounding tick that doesn't change speed with revs, it's normal, comes from the fuel vapour canister.
Should get two identical keys.