Buy them and measure. It might also say on a sticker on the rim (but still measure them yourself to confirm)
wanted to buy spokes at the same time if possible, that was my issue!
Rarely works out perfectly, rims can vary a little even batch to batch, never mind actually corresponding to manufacturers or retailers published numbers.
@jdmitch started
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Buy them and measure. It might also say on a sticker on the rim (but still measure them yourself to confirm)