KQRpassenger backrest and luggage rack, mounting quick realease kit

[ballbreaker]

Hoping some of the other riders can offer up some info for me on the fitment of the passenger backrest kit,luggage rack and KQR mounting kit. My question is has anyone using this set up on their Vaquero with a mustang seat and how is the fitment. From the pictures on the accessories site it shows it to be fairly low on the tapered rear section of the stock tapered seat. I have a mustang seat and don't know if it will fit being that the mustang seat is quite a bit thicker on the rear and am worried about it fitting up against the rear of the mustang seat. All opinions would be appreciated. Thanks