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Rule 8 The plurals for capital letters and numbers used as nouns are not formed with apostrophes.
Examples
She consulted with three M.D.s.
BUT
She went to three M.D.s' offices.
The apostrophe is needed here to show plural possessive.
She learned her ABCs.
the 1990s not the 1990's
the '90s or the mid-'70s not the '90's or the mid-'70's
She learned her times tables for 6s and 7s.
Exception: If the apostrophe is needed to avoid confusion, use it and be consistent within a sentence.
Example: Her 0's and 6's looked similar.
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Here are rules from grammarbook.com and it agrees with BOS on the caps with apostrophe - Jade
