“ what mortise cylinder use for von duprin ”

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The Von Duprin CD kit comes with the cover plate machined to accept the cylinder dogging mortise cylinder.1 1/4" mortise cylinder with an inverted straight cam is required for CD option on Von Dupr...
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
A 1 1/4" mortise cylinder with straight cam (similar to the Schlage B502-191) or a 1 1/2" mortise cylinder with straight cam using supplied spacer collar. Cylinder length does not chan...
A 1-1/8 through 1-1/2" mortise cylinder with straight cam per Step 4 of 512NL Instructions.
The cams for modular cylinders are unique and are not compatible with any non-modular mortise cylinders, Schlage or any competitors.
The Sargent cams listed below work for all applications except 16 inside and 50 outside.  The equivalent Sargent cam is the 13-0660. Use the B520-736 for modular cylinder lengths of 1 1/8",...
Schlage now offers modular style cams to operate the Falcon MA locks.  The following part numbers are cams for all MA locks (except the MA381): L583-638 for 1-1/8", 1-3/8", 1-5/8" length cylin...
Price Book 72A List Price $8.10
The Falcon MA-Series requires a different cam for keyed functions than its predecessor the Falcon M-Series.
 
 
Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference: