Soundcraft Unknown mixer knobs need help here

I have had these knobs for a year or more and I cannot identify from what mixer they came from as they arrived here in a box on there own.

I have a red, yellow and a teal green

Size is 14.6mm high 12.3mm , I am guessing they was off an EPM type as look more modern but I have no idea, would be very grateful if someone can tell me.

Price for 1 advise colour