They used many different ones
On our C34s here in the Bay area, I've seen many different brands on 1986 era boats, including Groco, Jabsco and we have a Wilcox Crittendon Head Mate.The Head Mate is better than the Groco or Jabsco, both of which are relatively useless.Peggie recommends the Raritan PHII as the very best unit if you're switching heads.