This is a new aftermarket replacement for the ZR1100 Zephyr Ingiter (TCI / CDI) which has been discontinued by Kawasaki.
The original ignition unit was made by Mitsubishi and this number may have been stamped on it 21119-1348, 21119-1350, and 21119-1378 (The original part is shown in the photo below)
The orginal part may have had one of these numbers stamped on it J4T03871 or J4T03872 or J4T03871
The new replacement ignition unit larger and will mount differently than the original part.
This unit has some improvements over the stock unit: