Could be cam cover gaskets. There is an oil trap in the rear right hand corner of the right cylinder head so if the gaskets are dried up that corner drips on the exhaust manifold first.
There's also a cam oil seal blank in that same corner, but they don't tend to leak. Or of course the cam tensioner gasket - they can often leak and also drip on to the exhaust manifold.
If it was the gearbox that would usually show from under the car rather than as far forward as the wheels.
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