HQ Standard Pt 20 R QM00272-2 Longarm Needle ^

You may use these needles for you HQ 16,  Avante, Amara, Fusion, Forte or Infinity, however be aware that you will need to quilt at half speed for these needles to work properly in your machine.
Choose size 20 needles for use with your thickest thread choices or when thicker thread causes skipped stitches. 

The Groz-Beckert MR needle style is specifically made for multi-directional use, which is exactly what longarm machines need.

Multi-directional design means more accurate stitching while moving the machine in any direction.
The MR needle style has maximum flexibility and bending to help reduce needle breaks and a deep scarf to mitigate skipped stitches.