Hi Mark,
The total height of the CB-68LPR is composed of three seperate heights which I measured for you.
1. Height of nylon spacer: 0.5"
2. Height of PCB: 1/16"
3. Height of Terminal Block Connectors: 15.3mm (about 5/8")
This brings the grand total height to be 19/16". I hope this helps and let me know if you need any further measurements.
Regards,
Jeff Tipps
Applications Engineer
National Instruments