Christian: Have exactly the same problem with mine, though i did have the original rear turrets chopped out and bracing welded in and stronger ones installed. The coilovers have been back to gaz several times now and they've now put slightly longer rods in. However this still hasn't really cured it totally and they stilll tend to knock when going over potholes etc or undulations in the ground at low speed where there is not enough 'downward movement' on the shock legs if you know what i mean. I'm currently in the process of having the turrets lowered and new strut bracing welded in which is costing me money it shouldn't have....as i said in a previous post tbh i wouldn't recommend gaz golds to anone after the hassle i've had with them! Before they lengthened the rods i couldn't really fit them as the car had to sit too low, in my eyes with the coilovers fitted you should still be able to retain the standard ride height and go lower if required.