I have a HWY 1 and I don't know the following specs. (Thinking of maybe having a custom neck made and want it exact to the HWY 1.)

Fingerboard edges: Semi-rolled or heavy-rolled?
Frets: Stainless or not?
Back Profile Thickness @ the 1st and 12th Fret: Thin C or Med. C?
Double-acting truss rod?

Go here and click on Specs.
http://www.fender.com/products/search.p ... 0111162300

If you want an old version Hwy 1 neck (small headstock) the specs are basically the same for the neck except it has medium jumbo frets.

Fingerboard edges: Semi-rolled or heavy-rolled? niether
Frets: Stainless or not? not
Back Profile Thickness @ the 1st and 12th Fret: Thin C or Med. C? specs says "modern c". Some people think it's thin, some others think it's medium. It's very objective. Maybe a Hwy 1 owner with calipers can measure the back profile thickness for you.
Double-acting truss rod? single

If you want a neck exactly like a Hwy 1, why bother with the trouble and $$$ of a custom made neck when you can get Hwy 1 necks all day long on ebay or craigslist?

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Obligatory gear list: Fender, Rickenbacker, Gibson, Gretsch, Vox, Martin, and more Fender.

I agree with Metro74...much more cost effective/avoidance.

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Being able to play and enjoy music is a gift that's often taken for granted.

Don't leave home without it!

You have a highway 1, and you want a custom neck made like the highway 1 neck that you currently have? Just trying to follow what you are looking for or looking to do?