Steering coupler replacement - 79 300sd W116

Have a newly acquired 79 300sd w116 - Looking for help/ advise on procedure to remove and replace the steering coupler assy. - this is the metal coupler with 2 Hex head bolts clamping onto the stering column shaft on 1 side & Steering Box on the other.
Do I
a) loosen pull out the steering column shaft via the inside steering column / wheel assy inside
b) Loosen - drop the steering box assy

Has anyone done this that can advise on the best way.

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