power steering to manual converson questions...

hi. just posted this in the pao section, but thought id try here too. ive just got myself a pao and im starting to sort stuff out. my current task is trying to fit a manual steering rack, but ive found that the splined shaft from the uj attached to the rack is 15mm diam, whereas the splined hole in the uj on the steering column accepts a 17.5mm diam shaft. does anyone know if another part will fit? would it be possible to mate my old splined end with the new uj shaft? the new rack is from a kreg micra k10. any thoughts appreciated.... karl.
 
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