Felt is the way to go. There's some in the center stack of my car that was there when I bought it, and I'm sure every other LS out there.
does anyone know why there is an indent in the rearmost cupholer on the 2003? it's a pain in the ass to clean. im not sure about other years
I soaked my rubber inserts for the cupholders in warm water + dishsoap for almost 24 hours and I still couldn't get them clean. There is like permanent soda/grime from the previous owner that is baked into the material or something. But yea Those things are very hard to get out, you gotta pull just in the right places
Sand Blast them.