Disk or drum spindle? Could still be either in ‘75.
The part number of the kit would be very helpful. The problem is that there are several different spindles that have Wilwood kits available, and if you’re trying to use the wrong kit for the spindle you have it won’t work properly because of changes in the wheel bearing and spindle diameter. For example, there are two different 10” disk brake spindles, and they use different wheel bearings.
