The BRNO ZKK set trigger uses two of the springs in your picture.....main springer (heavier one and I see two in your picture) and set spring (lighter one). The springs are retained by both pins. The trigger reuses the existing mounting pinand its tricky to assemble. You have a complete set up. You should be aware that the trigger for the 600/601 is shorter than the 602. Measure against your existing trgger to determine what you have. If not let me know and I'll measure one of mine.

Word of advice...don't part with your single trigger...you may want to go back to it and i'ts tough to find.

I've got a few single/set triggers/take down tools and one piece factory scope bases for the ZKK if anybody is looking. You can email rgg_7@hotmail.com Ron