[289ACE]

I measured today and found both spinners and the hub are 8TPI. I also measured the ID of both spinners (the major diamteer of the female threads) and found the Halibrands were 2.190" and the AC spinners are 2.205" so it looks like the diamater is off a bit and Ron hit it on the head. I am surprised that the thread diameters would not have been standardized for 8TPI, but it is what it is. The reason I was trying to put the AC spinners on the car was because I was missing 1 of the halibrands and was just trying to put the wheels on the car so I can move it around. I guess I am now looking for 1 LH halibrand spinner if anyone has a spare. Condition is unimportant (broken ears OK) as it will only be temporary. Otherwise, I'll have to try and find 4 hubs (and probably some bearings etc) so I can use the AC versions.
Dom, You are correct about the taper being different between the spinners, but since I am only looking for something to hold the wheels on while I pushed it around the garage, I wasn't too concerned about that.
Jay