part number for auxilary firel latch

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Yes, the top latch for the 25-V carried over from the 18-V device. Surface vertical rod top latch = part #650389 or #650375(fire rated)
The spring itself is not replaceable, you would need to replace the 19 centercase assembly.
Schlage does offer rabbetted latch and strike kit: Part number, 39-030, for cylindrical locks and deadbolts.  Part number, 10-075, for the L9000 mortise locks. Monarch does not offer rabbette...
The top latch for a Fire rated surface vertical rod device is part #650375-00 which replaced the old part #F588.