There are a bunch of options on Ambi safety selectors in this day and age. Radian tends to be the king, people love the look and feel of it, and as they should it is awesome. There is a new option that rivals this in my opinion. The AERO Precision PRO Ambidextrous Safety Selector. It has a great audible click when shifting positions and it has detent style retention much like the Radian options, so no levers going rouge and flying off with loose hardware. Check them out!
https://aimsurplus.com/products/aero-precsion-pro-ambidextrous-safety-selector-anodized-black
https://aimsurplus.com/products/aero-precsion-pro-ambidextrous-safety-selector-odg-anodized
https://aimsurplus.com/products/aero-precsion-pro-ambidextrous-safety-selector-kodiak-brown-anodized