Hi there. Another shock absorber brand worth considering is KYB. They make gas shocks for the 4 and are available at your local motor factors. I've found the two that were fitted to the rear of our 4 some time ago now, to be very good. Camping trips to France involving vast amounts of wine being carried don't seem to affect them, the ride is always excellent. The problem with the rear shocks on the 4 is twofold, one, they have to work horizontally, and two, they also have to work in the opposite direction to conventional dampers, ie extension not compression. Not many can cope with this.