von duprin thumbturn

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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...
The rim cylinder with thumbturn, XB11-979 (Figure 1) was designed to be installed on the inside head of the Von Duprin 98/99–2 double cylinder exit devices, see Figure 1. The rim cylinder with...
The thumbturn will work but the spindles sit 90 degrees off from each other (Schlage is square, Falcon is diamond).  The result is the throw will end up 10 and 2 o'clock instead of 12 and 3. 
Order the 09-900 with the XB11-720 option.
The thumbturn measures 2.085" in length and is ADA compliant.
See image below for the dimensions.  Designed to fit a 5/8" hole such as on the L9040.