Wanted 500 Series LIN6 Modules Wanted

Please bear with me, since I don't really know too much about the innards of the Whelen Liberty bars, but I recently purchased a custom mini Liberty that has three blue 500 Series LIN6 heads to the front, three to the rear, and two in each endcap. I would like to replace some of the blue heads. I am looking for one white head, three red heads, and two amber heads.

If anybody has any of these heads in good, used condition, and isn't asking for too high a price, please let me know. I would like to purchase them from you. Thank you for your time.