Jim, I haven't looked specificly for those as there were a half dozen in one of those cheap terminal kits I bought years ago at Straus Auto or similar chain.
Lemme look on duckduckgo.
OK. here's what to do. Search for piggyback terminal and then select pictures.
piggyback terminal at DuckDuckGo
here's a Dorman package with them.
https://www.oreillyauto.com/detail/...uick-splice-terminal-assortment/85412/4176614
