I bought about every guard made before settling on this one. Doesn't cut your boot, looks good, and most importantly doesn't catch your riding pants. Works great, ymmv.
http://www.touratech-usa.com/Store/3321/PN-046-0640/Heel-Guard-Left-Side-Yamaha-XT1200Z-Super-Tenere
$30 shipped to the US.
http://www.touratech-usa.com/Store/3321/PN-046-0640/Heel-Guard-Left-Side-Yamaha-XT1200Z-Super-Tenere
$30 shipped to the US.