In a message dated 11/1/2010 11:01:58 A.M. Eastern Daylight Time,
mtbiker62@GMAIL.COM writes:

The  plastic kind that hangs from the window slot on the inside (it works
better  than hanging it on the outside) of the door.
You can just take them off  when not in use and are easy to move around
over
there.
bob

even better get the boat kind, buoy mates IIRC.  I have a set of these  on
my doors of my splittie and bought extra attachment parts that I mounted in
my canoe . Now I can take them out of the bus and put them in my canoe so I
 don't spill my drink when fishing. Neat thing is that the swivel and stay
level  .  later  mark d