There are plenty of pics of t-20's in the gallery. I'm on a phone or I'd point one out to you. You don't have to remove the engine to access it, but it does make it easier. I've changes my t-20 fluid both with engine in and with it out. The fill and drain plugs should be 3/4" square plugs. The top plug has a vent so don't mix them up. The fill hole is about 1/2 way down the t-20 on the back side and off to the right. The drain is of to the left and 3/4 the way down. You may be only able to feel them and not see them with the engine in.
l like to buy stuff and no I don't do payments!