will my classic player neck fit right on a hwy 1? i thought the bridge on american standard and classic player was the same, but the fender spec says american standard has the wide nut like the hwy, but the cp doesn't

Yes, it will. In spite of the span at the nut, the neck heels and neck pockets are the same.

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what about the string spacing at the nut being different? don't want em sliding off the neck

My disclaimer: Each instrument is different and of course, your particular one, I can't hands-on examine. Consequently, I can only base my answer on my own experiences which are: I strongly doubt it would be a problem in the sense that the strings would be pulled more center to the fingerboard by the narrower saddle configuration. The worst case scenario would be having to cut a new nut with the strings appropriately retracted.

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never thought about having new nut cut. either way it will work out, so i'll prolly be selling the highway one neck