Center wheel cap replacement-
 

I just upgraded my wheels on my 07 Tahoe LT3 with 20" MB Wheels Gunner 6 chrome. The center wheel cap is plastic and it protrudes/raised dome.

I would like to replace it with a flat wheel cap and it's about 4" in diameter. Do any of you know where I can get a replacement and make sure it fits?

Thanks in advance!