I've got quite a few questions regarding dimensions and interchangeability of hands, specifically for a cal 861 Speedmaster mk2.

Could someone assist with the below dimensions of a Mk2 Speedmaster second sweep chrono hand, usually in orange;
1. Total length of hand
2. Length of hand from centre post to tip
Thanks, it is this hand.
Photo from vintagespeedmaster.com


Secondly does anyone know if the Chronostop and Memomatic second hands are interchangeable with the Mk2 Speedy?
They all look the same but will they fit the centrepost?
Chronostop is cal 920 and 865, Memomatic is cal 980, Speedy Mk2 is cal 861.