How do I tell if my spars are class legal?

if it has the sticker you can't miss it, they are various colors depending on the year, usually bright and/or shiny
 
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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