I use the Wompus rack with a top trunk mounted, it works with the Ultimate seat because it doesn't curve or angle in above the mounting spot like most other racks. Check with Wompus about sissy bar compatibility.
2014 V-Star 1300 DeLuxe
2014 BMW R1200RT (Recalled/bought back)
1984 BMW R80RT (Sold)
2006 Suzuki Boulevard C50T (Sold)
Seven others, 6 sold, 1 wrecked