Excalibur

Hey everyone, So I recently got my hands on the HP Z2 mini T1000 for my Dell Precision M4800 although it does not have a backplate on the gpu to mount the Heatsink onto the GPU, I read hear that many of you are using some nuts as an alternative to the X bracket because the X bracket cannot fit on this card. I tried finding some nuts myself to mount the heatsink but I am unable to find the right size. If anyone knows the exact type of nuts or the size or if anyone can share a link to where they got the nuts to mount the gpu heatsink on that would be of great help. Thank you :)