Calumet 100x80cm RM3062 Softbox with Speedring and Bowens S Adapter - excellent.

Bowens Mount Speedring Adapter – Metal Softbox Bracket Ring for Studio Flash

USED Bowens Luminair 80x100cm Softbox S Adapter & Speedring 2x diffusers grade B

BRONCOLOR PULSO 80X80CM EM SOFTBOX FRONT COVER

S Adapter & Speedring + DAMAGED/USABLE (D) Bowens 80x100cm Softbox 2 diffusers

Metal Speedring Mount Adapter for Softbox / Studio Light – Bowens Fit

Bowens 75X75cm APPROX Softbox including S Type Adapter and Speedring