rim vs mortise lock

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The "500" Series trim in general (510L, 511L, 512's, & 513K) will work with all 25 series devices and are not device specific.
A 1-1/8 through 1-1/2" mortise cylinder with straight cam per Step 4 of 512NL Instructions.
Recommend to order a new 990NL-R/V or M trim to change from TP/Classroom function to NL/Storeroom function. You will also need to reinstall the NL drive screw back into into the mast...
A modular cylinder's length is determined by 4 basic parts; a cam screw, cam, plug extension, and a back housing.  Most of these parts are used in more than one cylinder length and...
See descriptions for the 09-992 thru 09-997 parts kits for modular mortise cylinders.  The 09-998 is a kit for a rim cylinder.