-designed and made in U.S.A.-, modern solid-state circuitry, simple screw-in replacement of original transistor circuit... see more-designed and made in U.S.A.-, modern solid-state circuitry, simple screw-in replacement of original transistor circuit board inside amplifier box
-reproduction-, cars built before January 11, 1971 (mounts to voltage regulator, connects to ground tab... see more-reproduction-, cars built before January 11, 1971 (mounts to voltage regulator, connects to ground tab on regulator)