OH-4 Industries: Cup Holder
This "nearly" universal cup holder attaches to wheelchairs, scooters, stadium seating, airline armrests and office chair armrests. It not only works on multiple products but also holds multiple size cups. It can easily be removed and put in the dishwasher for cleaning. Comes with two velcro straps, two foam pads inserts and durable plastic holder.
We're sure there's something it doesn't fit, we just haven't found it yet.
* Not recommended for desk length arm pads