Luis, The 1A105 if memory serves me right is the size of the bolt..and pattern.
WE bought a new speed prop, for N6596Q the number was 7153. it was a McCauley. The prop and the information for same came from Precision Propeller, not sure but think they were in Idaho, have looked for invoice this am... but haven't found it as yet. Audean Woollard N6596Q
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