My ML has the black with the chrome star (US version) and the SL has the badge version in chrome (also US version).
I had the black euro version on my 300E, but found that it couldn't withstand road debris very well and pitted...so I opted for the chrome one...got it at:
www.************************
The plastic filler slot is easy to remove...just don't damage that metal rod near the bottom that seems to have a cable attached to it...that's your ambient temerature sensor...