The (2) mounting studs on the 914KIL or 914KIL-IC changed from 3 1/2" center to center to 4 1/2" CTC in April 2002.
At that time, the Center Case and Center Case of the 19 Series devices were changed to accommodate the new 4 ½" CTC mounting post spacing and the 3 ½" CTC spacing still used for some 19 Series Trims and the older 914KIL trims.
Due to this, an older device prior to April 2002 would need an new center case & new center case cover to accommodate the newer 914KIL/914KIL-IC trim.
See attached parts manual for center case & cover part #'s if needed.
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