Just an update in case it helps anyone. The video and information sheets given in previous replies are very helpful but the towbars shown are not exactly the same as mine. Nevertheless it would be possible to fit my towbar with this information and a bit of commonsense. However, being super-careful I thought I would look into things a bit more. It turns out that my towbar is made by Hayman-Reese, and they were very helpful. I took a punt on the H-R part number and this turned out to be correct. They faxed me a copy of their fitting instructions in a few minutes, and they show my towbar exactly. The part number on mine, Branded Subaru Australia and Subaru Forester, is SA1032. This matches with H-R part number RL1909. It is for the late 2003 onwards Forester, probably to 2008 model I think but not sure. Also Cepac Towbars in Glen Waverly were very helpful with some small bits I needed. Thanks again.