Got some unexpected time off... so cleaning the shop.

$65 plus actual shipping. 

The hardware, metal spacers, and metal plate that are specific to the C10 are in excellent condition and were used on my '99 -- always garaged.  I sold the bike but kept the Givi box, so ordered a mount kit for my replacement bike ('96 BMW R1100RT).

I used my original plastic mount on the BMW.  So the only part that could possibly ever wear out -- plastic mount -- has zero miles, it's never been installed on a bike.

Here's a link to the part -- which is no longer available:  https://www.twistedthrottle.com/givi-topcase-rack-kawasaki-concours-gtr1000-zg1000

Here's a pic of the actual parts, laid out the same as in the Twisted Throttle link above.