2 hour fire rated assembly

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Fischerj00

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Seattle,wa
Our company does very little apartment work. Apartment is 1 story below grade and 4 above. Code and building type allow for use of nm-b. The basement level has a 2 hour fire rated assembly for the ceiling. The assembly consists of 4 total layers of 5/8 drywall and a 7/8 firing strip for a total thickness of of aprox 3 3/8” thick. Anyone have a suggestion on what type 4/0 box to use for light fixtures. Most plastic boxes I find are less than 3”
 
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