You don't have two holes in your shackles? You do have a Belltech hanger and shackle kit?
Yes, you can use any spring. They are independent of the spindle.
If you add a flip kit like you have it now, my figures would make it 9" of drop. To use a flip kit, and end up with 6", you need to put the stock hanger back on and use a 2" shackle. If the shackles you have now are 2" longer than stock, you are OK.
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