Thanks guys. Sounds like the one 14mm head I can see is probably the one then. Should have trusted myself in the first place!

Hi there. I have just started doing some basic maintenance on my Hilux (2005, 3.0L turbo diesel, 1KD-FTV) like changing the fuel filter and air filter, and I now want to do an oil and filter change, but I'm buggered if I can find a a diagram or photo anywhere of the location of the oil drain plug. I ...