I have a '74 Yamaha TX750 and would like to get some carrying capacity. None of the makers of luggage that require racks seem to make frames for this model which leaves universal saddle bags as an option. Ideally I would like some that could mount under the seat and not require removal of the rear turn signals. At the turn signal there is 12" from the bottom of the seat to the top of the exhaust, 17" from the top of the seat to the exhaust, and 15 1/2" from the frame under the seat to the top of the exhaust. There is also about 16" from the turn signal to where my butt would be while riding. It would be nice to have bags that could travel empty so there would be a place to put gear (gloves, pants-which easily fold to 13x10x5, etc.) while walking about on day trips, and that would also leave room to use something like a Wolfman Beta Plus for longer trips. I'm considering something like the Givi T469, MotoCentric Cruiser, or Saddlemen Expandable Sport. Any suggestions would be greatly appreciated.