Stiffest 60mm rear springs????

What’s the stiffest rear springs I can get of the shelf for my 4door saloon? The ones I have fitted at the moment are far to soft and I can’t have anyone in the back with out it scrubbing.
I know this is partly due the the wheels I’m running but the springs are very soft compared to the bilstein on my hatch, unfortunately the bilstein on my hatch don’t come in 60mm.


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Most off the shelf springs are a fixed poundage, so you're better off going custom and requesting a higher poundage that way!

As already said, ring gaz they used to make custom orders