Lower mast usually forward below the gooseneck, boom right near the connection to the gooseneck, and upper mast just above the collar. You can't miss them.
The class sticker only indicates that the spars have been supplied by a class builder. Older spars definitely didn't have stickers, so the lack of a sticker makes me look more closely to see if the are any other discrepencies. New looking spars without a sticker would make me seriously question the legality of the spars.
Whilst it's mandatory to use builder supplied spars, I have rejected many spars, even brand new because the fitting and sleaves were incorrectly located. Further, there is a requirement that the spars are straight (for the mast). So the short answer to your question, for the spars to be class legal, they must be class builder supplied & must measure in.
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