von duprin removable mullion mortise cylinder length

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Von Duprin KR (key removable) mullions requires a 1-1/8" or 1-1/4" mortise cylinder with the standard straight cam, the cam is not inverted. Please see chart below for part numbers. 
instructions
The KR4023 mullion requires a 1-1/4" mortise cylinder with straight cam. This is stated in box 7 on the first page of the KR4023 mullion instructions.
Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference:  
There are different mortise cylinder length options depending on the cylinder type. Below is a list of available options for conventional, FSIC, and SFIC cylinders, as well as the convent...
These cylinders are designed with a microswitch attached to the back of the cylinder. The switch is operated by a cam when the key is rotated.   To order: XB09-195 Mort...
The XB09-195, XB09-795, and XQ11-804 are basically modified mortise cylinders. The overall length of the mortise cylinder switch is approximately 1-9/16" (1.563"). The diameter of the cylinder face...
Key removable option is not available for any of Von Duprin aluminum mullions.