I thought I needed RHS Z-rack (as well as other items) for minor transit damage on my K75s. At the time (Dec 2014) motorworks in the UK had used Z-racks available ... (
http://www.motorworks.co.uk/vlive/Shop/Parts.php?T=4&NU=10&M=40&Ct=ZA) but it was only the bushing that had failed.
I will be placing another order with them shortly if you want to add to it and share shipping cost (I'm just outside Halifax). PM if so.
Gio
Edit - Pair if Integral T3 (blue) pair off an 1100 on bmwmoa.org (asking $300) - I'm told use the same Z-racks and would fit K75/100 ??? (not my listing - just trying to help you out)