A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
I have a complete set of brackets that came off of a 2018 NC750. I bought these from one of the members here but it did not fit my 2012. Some of the bolts may not be correct, I switched some to use with my new brackets. I would ship these anywhere in the contiguous US for $75.00
I swapped some with the 2012 kit so these may not all work, they were a little too long for the 2012. Bolts are readily available and easily cut down, if need be. I never thought that I wanted hard luggage but I'm a convert.
I have a 2018 NC750X, and may be interested.
Are these the correct brackets for Givi model V37 side cases? If this can be definitely confirmed, I'm interested.
(Otherwise I'll be in the same situation you are with them.)