Rear springs on astra j type hatch 1.

[red astra]

Hi there. 

I the process of doing rear axle bushes and noticed the 2nd coil is corroding at the top as if rubbing with the top coil. Bottom coils appear to be more spaced out. Leads me to wonder if the springs are fitted upside down.... Can these be fitted the upside down? Is it possible? Thought the coils closer together would have been on the bottom. Any help would be appreciated