The RA60 came with a few steering options,
Fixed steering column, and Tilt adjustable steering column.
With either Manual or Power steering, The Fixed column and Manual steering are common in the ST coupe.
Q: Why go to power-steering ?
But anyway, i will have all the parts you need, as i have usually changed my cars from Power-steer to Manual.
I can swap parts with you as i always need Manual rack's.