Not as a straight 'plug and play' BUT I have fitted one and it looks MUCH better than the
1150 pizza delivery box (obviously smaller too).
Much sleeker and sexy.
Anyway what you have to do is take a hacksaw to the four tubes on the base mounting plate that normally fit under the 650 rack - shorten them to about 4-5mm. I also shortened the baseplate by about 2cm (if I remember correctly) on the saddle
side (alumimium grab rail removed)- this brings the base plate a bit further inboard without interefering in clearance getting seat off. Using large washers on the top of baseplate and below bolt 4 bolts through existing rack (much in same manner as the universal mount ones)to secure. The mounting plate sits about 20mm above existing rack
due to mounting plate but once on looks absoutely normal and gives one this bit of extra space below
topbox for storing extra puncture kit, cover ...whatever.