yeah the end cap is removable but it should also have that green plate, it might have been painted over if the box was refurbed. Dont take the end cap off if you can help it, you'll loose most of uyour oil and also theres a selector rod that sticks out here, if you remove it the box needs stripping down to refit. no point risking that when you can do all the repairs thru the green cap! just make sure you buy a newun.