All 4 are different
i asked the same question not long ago, an have still not managed to find no 2 and 4, plenty of people have said they just went with 2x no 1 and 2x no 3 which while not correct works well enough.
My new ones (2x#1s and 2x#3s) arrived this morning so going to fit them this weekend, and i'll update after i try..