Well as a followup to this , I had success, I ordered that wiring harness that was mentioned earlier in this thread ($19.99 ) US funds , unfortunately the freight to Canada here was $38.00 USD ....and then when I factor the exchange it was almost $80 cdn ....more than I thought was going to happen......but that's okay, it came in yesterday...... I temporarily taped the right colours to the right colours on my Dual radio from a RV I had, and sure enough it worked..........the speakers seem to be in the front part of the headliner (that is where I hear the sound from ) ....so this weekend I will do a proper solder and shrink wrap of each joint and figure a way to hold the radio up there in the slot . My RV (Dual brand) radio did not have a installation frame come with it , so I might have to do some wood trim and other creative means to hold it up there ! So I can confirm that even the Canadian supplied 2016 Kubota RTV X1100 C come prewired with speakers and antennae already in place, you just need a radio and wiring harness from Kubota plug to bare wire.