I bought a large Butler cup and holder for my 2006 Gold Wing and I love it. I did what you suggested about putting about a foot or so of 3/8 inch clear tubing on the end of the straw so I can use it with my full face helmet. It works perfectly! An absolute ‘must’ for driving around in this 104 to 110 degree heat. After four hours on one of my trips the cup still had ice cubes in it!