Like Dave I got two of the inexpensive brown ones from Wal~Mart, cut off the
tops and drilled two holes each. For the driver's side using a smallpiece of
wood (D.3/4" X L.2" X  W.1 1/2") I attached it to the cabinet directly
behind the driver's seat belt anchor bolt so the bottom of the cupholder
sits on the floor as the base.  The passenger's cupholder is mounted to the
right pillar with a piece of  90 degree alluminum strapping just behind the
passenger's seat belt anchor bolt again using the floor as its base. Two
bottles of water sit in these holders always for both driver & passenger!!
No dash disfugurement, out of the way with no movements and no spills ever
in ten plus years.

Sam