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Looks like this Y55 Heartbeat has on eBay would be correct other than it's missing the Energizer word also note the Delco isn't Yellow so it's not a service part or may be from a different year than noted?
https://www.ebay.com/itm/67-68-69-Ca...sAAOSw96ZcEuvl
Cheap solution even interim may be use a Y59 Topper and modify the +/- symbols to the opposite positions...easy to alter the - into a + w/ a hot screwdriver tip but you'd have to get more creative w/ the other one.
~ Pete
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