These are squad 51 die cast from Universal, Imperial toy corporation, JA-RU, and Larami. There are more but I don’t remember the names. There are 6 different variations that I know of. There are 2 variants of the white squad: JA-RU die cast rescue, and another one with just Red Cross labels. There is one military green Red Cross squad. And there are 3 variants for the red squad: One with no labels, one with a gold shield on each door, and one with a gold shield and red,white, and blue lights in a set by Imperial toys. That set s very, very hard to find and it’s very expensive. There could be more variations that I do not know about🤔