Replaced my old wired smoke alarm with the Nest Protect battery. The standard mounting plate of the Nest Protect battery model did not fit my existing ceiling distribution/central box. So I remixed the standard model to fit my needs.
Check out this remix from mrkb_ for better compatibility with different sizes flush box.
Should work on the wired Nest Protect too but I haven't tested it.
The author remixed this model.
Replaced holes with 65mm in between