First YX is not the head code. It is a block code. You could have different heads on the block. That said those heads might require the tapered seat plugs. I tried looking for your "17Y" plugs and all the ones that I found had more letters in the designation. Look at the spark plug hole and see if the seat is tapered or flat. If it is tapered you can use an AC R45TS plug. If you can post your Head code and casting date we could be sure.
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