525 TDS Touring Ride height ?

I have a 525TDS Touring and the ride height at the rear seems a bit low.
I had the rear springs replaced (the new ones were 2 inches longer than the
old), but the ride height is little different and still seems a bit low.
Can anyone tell me what the gap/overlap should be between the top of the tyre and the bottom of the mudguard/bodywork at the centre top of the rear wheels ?
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