I got a ball mount from amazon, and two sided taped it to my ashtray (94 FZJ80). Very solid and the ball is fairly universal.
Ball - https://www.amazon.com/gp/product/B002T0EK64/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 (cheaper available, bought in 2011)
Cell holder - https://www.amazon.com/gp/product/B00X1E5GS8/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1 (again YMMV purchased in 2015)
they both still work