Bought one of these myself but I can’t seem to mount it on my 2015 FJ09. Front holes line up perfect under the seat but the rear ones don’t line up with the mounting points for the passenger handles. It looks like it was machined incorrectly and they face a bit too inward.
It didn’t ship with instructions, just two longer bolts, two long spacers, and two washers. I figured it looked straightforward enough.
I reached out to T-Rex Racing to see if they had any tips or next steps. I’ll update here when I get more information. Besides not fitting on the bike it’s exactly what I wanted in a rear rack.