SBC Valve stem seals
What you have is 3 different type seals. The blue ones are rubber seals from a Fel-Pro gasket kit. The brown is a rubber umbrella seal for the exhaust. The black rubber o-rings seals are the cheapest made which nobody uses anymore. Fel-Pro uses two different seals for the intake and exhaust. QSS72527 for intake, and QSS72526 for the exhaust. There also should be an installer in the package or you will damage the seal and it will leak. For the installer check out Auto Zone they carry the Fel-Pro seals.