For sale: 17mm OEM rear anti-sway bar from 04 MCS (sport suspension package). I used this only for 8,000 Kms before switching to 19mm H&R and it is still looking new including part number stickers from Mini. Great for Mini Cooper non-S (came with 16 mm as OEM). Can also be modified by drilling a hole of about 3/4 inch from original hole to make it slightly stiffer.
$35 including rubber bushings.

 

Priced reduced to $35. I am cleaning up my garage. Calling Mini Cooper owners.

 

Try two other forums:
www.vancouverminicooperclub.com and www.sizeminiclub.ca
Both have for sale sections and it increases your audience.

 

Great upgrade for '02 to '06 Coopers without the Sport Suspension Plus. I installed the 17mm bar to my '04 Classic, very noticeable improvement. (although a bit unnerving at first - you don't expect the back end of many front drive cars to feel like it will come around on you, but don't worry, it won't get you in trouble, but will balance the car a little better to hold the line in hard cornering and resist plowing understeer)
Good luck with the sale - this is a great cheap upgrade for someone out there.