Why we like these:
Ambidextrous safety selectors are great for both right and wrong handed shooters. There's really no downside to having them, they just give you more options for keeping your rifle on 'safe' until you're ready to fire. These are another product from Schmid Tool, an OEM manufacturer who makes quality parts. They are precision manufactured from high-grade steel to the correct milspec dimensions.
These do not come with the allen tool that is necessary for installation, so be sure to have one of those on hand.