These are 3D printed cooling shrouds for the AMD Instinct MI25, MI50, and MI60 Accelerator cards.  

I just added the 40mm Narrow, it adds only 35mm or roughly 1.5 inches to the length of your card.  I will have the 40mm Delta server fan available soon, this fan pushes around 40cfm and is loud.  

I've only tested these on the Instinct MI25 but it may fit the following models as well-  

Check the pictures for dimensions of the connecting plate.

Nvidia Tesla M10, M40, M60, K10, K20x, K40, K80, P40, P100, V100s
Nvidia GRID K1, K2, K340, K520
AMD FirePro S7150x2, S9100, S9150, S9170
AMD Radeon Pro V340, V520