I noticed that there was a bit of oil coming out from under the bolt cover, grabbed my socket set went to nip it up and it came off as a put the socket onto it, how the hell do I replace it? And where do I locate another?
Only those willing to push themselves to far will know their true limits
by the look of it, you'll need to take off the rocker cover and remove the bolt, which, i think also holds the rocker gear in place. Toyota would supply one new if you can't get one from the wreckers.