All light shapers with a Bowens connection fit. There is a huge selection on the market. All the Chinese use this connection. Jinbei, Godox etc. Walimex is also mostly Jinbei. SMDV speedboxes are also highly recommended because they can be set up and taken down very quickly. This is partly not possible with the cheap Godox softboxes. They have to be painstakingly dismantled.

With Bowens connection

Basically, a distinction is made between flash softboxes and softboxes for studio lights. The flash softboxes are intended for the compact clip-on flash and do not have a thread/connection but rather Velcro for attachment. What kind of softboxes are you looking for?