I have both MSA's and some from Auto Zone they carry two brands. Bosch and darn it I forgot the other name. Cheaper but same again. The local stores are much cheaper in price but they DON'T come with the nice new rubber boots like MSA's. What ever you do... don't use the crimp connectors. Solder them if you can then shrink tube it, or use the really cool white lock tight twist type connectors. Pricy but worth it...The wires on the connectors are much smaller then stock wires you will come to find out.