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What is the difference between the Von Duprin 556WD-NL cylinder assembly for 1 3/4" vs 2 1/4" thick doors?

The cylinder spacer collar is the only part that is different between the Von Duprin 556WD-NL cylinder assembly for 1 3/4" door and 2 1/4" door. 

Cylinder spacer collar part number for 1 3/4" door is 960676-89 and the cylinder spacer collar part number for 2 1/4" door is 960689-89.

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