Trying to identify g/box parts in my x2c...

[Dandare]

My x2c was purchased 2nd/hand, my understanding was it had one uprated idler fitted, another one (AR28T) was supplied with the car, but not fitted. It apparantly had Uprated diff balls.

I've stripped the g/box & found one black plastic idler (i presume the AR28T already fitted) & a nylon coloured one ie, beige. Are the standard x2c idlers this beige colour ?

Regarding the diff balls, mine are normal chrome silver in appearance, i guess i can't tell if they're actually uprated, would they be a different colour if they were ceramic ?

Thanks