I want to check the level of the tranny fluid in my 1974 MG midget. The Haynes book says that the filler pluf is accessed from the inside of the car under the carpet through a rubber grommet. I can't find this rubber grommet, so is the book wrong and this is filled somewhere else. Due to a noisy first gear, all other are ok, I have a feeling the guy I bought it from used standard gear oil as opposed to 20W-50. I would like to drain it and refill, but I cannot find the correct location.