Z-Gantry T-Nut - McMaster Carr Part ID?

I have a 3’ wide gantry on the desktop pro and the instructions show 22 T-Nuts are needed for the 3’ wide gantry and 16 for the 3’ wide gantry.

In the CRP934-00-36-FAST package I only have 16 T-Nuts.

Is this part bag short or are the instructions incorrect?

I live near a McMaster Carr, is the part number known for this so I can pick it up ASAP?