These are used everywhere in the sim. (I have at least 30) when I started out, these were the bain of my life! Quality varies from china and can cause you a real headache! Usually they work fine individually, but when you need to daisy chain, some can be an absolute nightmare.
If you find a good supplier stick with them! And post a link here.
Go for the detachable type (green) as you then can change the colour or size of the display to suit your needs! Try to fins the ones that have the brass standoffs and screws included like in the link.