This is a high quality rubber backed steel end case plug that is the correct depth and size as stock. It has no oil guide. This will work best on the small input shaft bearing bolt transmissions like a 91/92 18 spline unit with the 7mm headed allen end case bolt. It can be used on the later models, but stock they have an end case seal with an oil channel to help direct oil to the input shaft. We also sell that part.