The easiest way to do the struts is to remove the lower leg and put the seals onto the chrome cylinder and slide into place. I use a expanding automotive piston ring compressor over the seals to get them past the threads on the upper strut housing, and a couple of pieces of large PVC pipe to push the seals into place. One piece is a PVC coupling with the ring in the center removed, it should be as close to the strut diameter as possible, the other is a adaptor that is the same size as the strut on one side, and as large as possible on the other to act as a pusher.
something like this for the compressor, you want as long a reach as possible into the strut
http://guide.alibaba.com/shop/4-in-piston-ring-compressor-by-usatnm_36207002.htmlsomething like this for the pusher
http://www.lowes.com/pd_23318-1814-PVC+00102++1000___?productId=3132737&pl=1&Ntt=pvc+pipe+couplings