Check the specs on the Allparts site. Unless I missed an exception, they're all 10" radius necks. And if they do have a Jazz neck with a 9.5" or smaller radius, please let me know.
On a related note, Mighty Mite necks have a 9.5" radius, but coincidentally or not, they stopped manufacturing Fender-licensed necks and bodies around the same time FMIC started selling their own necks and bodies. I remember because I was shopping for another Mighty Mite Jazz body when all of a sudden, model after model started showing up as "Out of Stock" across the main retailers. Then, within a couple of months, I started getting notices of "Genuine Fender Replacement Parts" left, right and center.
It was as if FMIC either pulled their licensing agreement or simply didn't renew it. Someday, I would love to brace the people at Mighty Mite to get their side of the story and put my speculation to rest.
As for Warmoth, it's probably one of two situations...either they
won't cut their necks to Fender specs or they
can't. Beyond that, who knows? And if someone does know, they ain't talkin'.
USA Custom Guitars had a bunch of interesting options, but I never got around to ordering one before they closed up shop. 'Tis a shame, because I was really curious to know what a 7.25" to 9.5" compound radius neck felt like.