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Got over to storage today to measure and found my original was not as apart as I remembered, still all together. However, did measure the welded together one, the part I measure is same as my '64. The dia of the steering linkage tapered shaft, going into the pitman arm, opposite the nut in first photo below is 0.750". Rested the calipers right on the pitman arm surface for this measurement. The steering linkage threaded shaft, that goes into the pitman arm is 5/8". Hope this is understand able.

Also couple of photos of the made-up steering linkage to adapt newer Dana 44 axle to '64 to '66 K10 steering gear box.

Hope this helps some. After looking at the Moog Master Parts catalog, if you need any more measurement from this steering linkage let me know.

Yes, those are original Camper Special wheels 16.5 x 9.75 to the right in last photo.

Les