Use a 6" bearing and cut the excess. I recently replaced my strut with one that uses a larger cutlass and a 6" version isn't available. I had to use two 4" bearings and cut the excess on both sides. When the two bearings were pressed together, some of the rubber squished into the bearing service making the shaft tighter. It wore free within the first 10 hours or so of use, but it was annoying and had me and the yard who installed the strut wondering if the alignment was off. It's also difficult to align the water grooves when using two bearings.