Wal-Mart most often has the full Mobil1 line of oil. As for Oil Filters, I have never bought a M1, but save yourself the trouble, and go to NAPA, and buy a WIX Racing Filter. Its much better quality and the only thing I install on my boat(s), car, and truck. (NAPA Wix (red top box) for car and truck, NAPA Wix Racing (all black) for boat.)
1061R fits HP500s.
1060R fits 496HOs.
(Dunno what the others are off the top of my head.)