what cylinder for Von Duprin Mullion?

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Answer
The Von Duprin 4754, 4854, 9954, and 9854 mullions can be converted or ordered with key removable option. KR54-F kit is the conversion kit to convert the above mullions to key removable mullion.
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.
Order the 4854 mullion 'BLANK' x size x finish
Key removable option is not available for any of Von Duprin aluminum mullions.