For a 562, 5501106 is correct so:
Did it come in the original packaging?
Is it an Omega crown and are you sure it is completely clear of the old stem?
The higher numbers of the 550 series (563 to 565) use a 5631106 stem and the winding pinion plus setting lever change so, the stem is different in that area. Both are the same threaded portion at the crown which should be tap 9.
You probably have the wrong stem.
Regards, Chris
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