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That is a copper "buss bar" or conductive copper strip, connecting the breaker points to the insulated terminal/screw that the pigtail hanging down from the coil makes contact with to complete the primary ignition circuit from the coil to the breaker points. The only "factory" way to replace it is to buy a whole new breaker plate assembly. My guys simply make a new one by scavenging a piece of flat copper strip from an old pair of breaker points... the coppper strip that runs parallel to the flat spring on better-quality breaker point sets. There is NOTHING "magic" about using a copper strip, and you can fit a length of insulated stranded copper "pimary wire" in there, if you so desire. The terminal at the top it connects to MUST be insulated so as not to make a "short to ground" in the primary ignition circuit. If the insulator is "bad", some guys have replaced the insulator/captive brass nut with a platstic "nut", such as is popped into car bumpers to attach the license plate.
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