sussed it out. The serial numbers for the front and rear shocks are alike at the end . Front-318546 Rear-321546 So whats happend is the bloke that picked the parts has missread the order,and just looked at the last 3 digits. So i've got 4 rear shocks.

Interesting as to what Brick said they do look at bit weak at the tops they've not welded the inside of the eye. Thats another job to do then might aswell weld them my self.
I havn't heard that they had a weakness they always rave about them.
But will do it anyway. Cheers

de carbons r miles better 2 years of no care just abusd to hell no probs ,I know lots of folk who fitted pro comps and complained when the tops snap off, Some get there money back some don't,Where i work we refuse to sell them.