I've never seen part numbers on the spindles. There is some numbers on the late radial spindles but I believe this to be a production number and not a part number per say.

Randy look at your discs, if they are 11.7" and bolt to the hub from behind then they are 1986 Turbo. The non-Turbo has 11.1" discs. If they are later than 1986 then the disc slides on from the front instead of bolting on from the rear of the hub.

The easiest was to know if the spindle is for an early Turbo is to measure caliper mount, 94mm = Turbo and 76mm = NA.