VRAM Thermal pads thickness for iMac late 2014 27" 5K Retina?

[DroopySWE]

I don't know what millimeter thickness VRAM thermal pads I should get for my iMac 27" 5K Retina late 2014 (A1419 model). Anyone know the answer?

 

[adib]

For connecting the VRM to the back plate? Use Play-Doh to simulate the placement of those thermal pads. Place it between the VRM and the back plate, let it squish, and then measure how thick the squished part is.