There is a wood backing behind the leather. It is really a pressed fiber board. I just used the screws provided. They are self-tapping so there is no need to drill. I thought mine came with four screws. A post before mine says it only came with one. If it just comes with one screw, then go to your local hardware store and get three extra screws. The screws are not very long, preventing you from going through the wood and interfering with wires or the power window mechanism. FWIW, I had originally purchased the other cupholder from the dealer (which I eventually returned) and noticed that the screws that it came with were the same length the one from Griot's Garage came with.

In fact, I recommend not to drill. I thought I'd drill a pilot hole for the first screw to make a clean installation, and the leather got sucked around the drill bit and made a helluva mess. I had to unwind the leather from the drill bit and smooth out the leather to make it look normal.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".