Oh, btw, you don't really need to drill holes. The screws are self-tapping. The material you're going to screw into is sort of a pressed board material. It holds the cupholder tightly, but you need all the grip you can get.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".