The early '09 front springs all all tapered, with the exception of the main leaf. The '10s second leaf is like a late T, with chopped 45 degree corners, but not tapered. I don't know when they went to the plain square second leaf? I know 12-15's have the square second leaf. BTW, if anyone needs to know what HP stands for on the top leaf, it is Hess Pontiac.