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I did a 944 NA conversion on a 67 bus. You're right, the bearings are the same between bus and 944, but the 944 spindles are shorter (ie, the bearings are are closer together than on a bus). Hence you need to make up some spacers and put then under the bearing races (inner and outer race) in the 944 hub so that when mounted on the bus the bearings will be the correct width to match the bus spindle. I machined the spacers out of 6061T6 aluminum. That's all it takes to mount the hub/disk. Then make up the caliper bracket and you're done.
Good Luck.
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