Late '66 thru '69 BOP (Buick/Olds/Pontiac) will fit.
By 1970 they went to a different axle with a more durable tapered roller bearing as opposed to the more failure-prone ball bearings used on the earlier axles.
When the ball bearing axle bearings failed they usually spun the inner race on the axle, turning it into unusable junk so used axles in good shape are getting hard to find.
That said, I'd save myself the hunt and buy a new pair of replacement axles from Moser Engineering.
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