Hey Neil,
Those look ok to me. They have the rounded end lume inlays typical of the 'narrow' version of the hands.
http://speedmaster101.com/blog/2998-alpha-hand-length/
Yours appear to be the ones on the left of the image on Spacefruit's site.
Hard to tell from the angle of the pic of them fitted, but I think they're the correct length. Can you lay them on a ruler?