This funnel turned out to be wonderful for the intended application, installing oil in the MGA or early MGB top-fill gearbox, where you handle the oil over the carpet inside the cockpit. I picked it up at Walmart for cheap. It is small on the bottom end to fit into the gearbox fill port, so don't pour too fast and overflow.

The trade name is "FloTool" from Hopkins Manufacturing Corp, Emporia, KS, USA. Their part number 10701. It also works for fuel additives, as the extended small end will open the trap door in the fuel filler neck of modern cars.

And it is small, so it travels well. It is about 9-inches from bottom to horizontal top rim, a couple inches more for the top angled splash guard.