THESE MOUNTING PLATES ARE THREE-DIMENSIONALLY MANUFACTURED. They are non-oem plates. But they work perfectly. 

These are specifically designed for to fit the following Kidde models:

900-CUAR
KN-Cope-Ic
KN-COSM-IB
KN-COSM-IBA 
P4010ACSCO

And the following Firex models: 

FADC
ADC
AD
1275
1286
1285
PI2000
i4618





These WILL NOT fit the i2000 series devices.

i4618AC SMOKE DETECTOR IS SHOWN AS PHOTO DEMONSTRATION ONLY. SMOKE DETECTOR IS NOT INCLUDED.

Includes two mount bases, screws, and drywall anchors.

Being that they are printed, plates may show various imperfections, blemishes, extrusion lines, etc. 

Please see photos.