right heres the pictures dont panic i havent been in the bath all this time lol

new bearing and oil seal in hub without any spacers.

new bearing, oil seals and spacer.
(Bearing details: C107 8896/10)

old bearing including metal oil seal bent up as it was the only way i could get it out, snap in clips, middle spacer and rear spacer.
(bearing details: Poland CBK-171 FI T-1 T)

the old and new middle spacers (the old ones not squashed???)

here you
can see how much smaller the old spacer is.
just measuring from a rule the oil seals are also smaller but only by less than 1mm, but im sure that makes a big diffrences as it all fitted in the hub nicely with the spacers and snap in clips in place.
from what ive been told by the suppliers there is only one bearing kit availiable for the rear of a 126 ac
but further investigation suggest other wise....
http://cgi.ebay.co.uk/FIAT-500-126-REAR-WHEEL-BEARINGS-FULL-KIT-BRAND-NEW-/200436307862?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2eaaef5796this one looks like the same as the old one
http://www.fiat500ricambi.com/fiat126/?categorie=Rear+axles&product=AA1016and this one is my new ones!