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They fit the description and measurements but don't have the circlip groove.
IDK if you found some Ashcroft halfshafts or not (lets hope), but....
Do you have the complete halfshaft and cv joint removed from the parts rig?
The circlip groove is where the cv joint slips over the halfshaft. That circlip needs to be there to lock the cv joint in place.
Where the cv joint end comes through the hub there will only be threads for the locknut.
Thanks for the parts diagram.... I just got the second half shaft removed.... all the bolts came out super hard. probably because its been setting for years.
I'm confused why you're measuring the splined part? That would remain unchanged for HD or non HD, as they both fit into the same hub assembly. If anything the smooth section would be a different diameter, but typically it's just a different metallurgy