I removed my rear seats in the R33 today as part of a speaker install to find a bunch of water/condensation behind the cushion. At first I thought maybe I had a leak in there, as it has been raining heavily for the last few days here. But I then remembered that the fuel tank was behind the rear seat and it was most likely a cold-soaked tank of fuel responsible for this. No rust thankfully, but I figure this may be a good heads up for R33/34 owners to check behind the rear seat for possible issues with rust forming.