I'm not sure anyone answered your question.? But FWIW, using calipers on my QC42, I measured a distance of 30.9mm (1.217") between the spindle centerline and the mounting surface of the compound.
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In the photo you can see that measurement and also the side of my AXA tool post.? There is a 0.2" spacer under the toolpost so I can use the same tool holder position on this AXA as well as on my 13" lathe's AXA.? That size tool post serves both lathes just fine.
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HTH,? Bill
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US;USAEDFE, 72-74
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Bill Buckalew