Hey all- I'm looking to get new grips for my new ride. I had Kuryakyn's on my Fatboy, which were already on when I bought it, and I loved them. I've found some similar to my old ones on Revzilla. My questions are these- The grips are described as "Kuryakyn ISO Grips For Harley Fly-By-Wire" and the premium set includes a "Throttle Boss". What do 'fly by wire' and 'throttle boss' mean? Thanks for any info!