Look at the top you can see it clearly,I have 70 backing plate when i orderd the 69 wheel cyl,witch I though i had its the oval shape,i need the the square one,so we ordered the 70 wheel cyl well it fits but my flex hose is to big to fit in the 70 wheel cyl my Q is there 2 different wheel cly, for v8 to /6 :banghead::banghead: