I agree with my fellow collectors and you have the building blocks for a full Chicago PD Mars bar if that's your intent (although they used the wider 5.5" bar). You're lacking the can lights, Clarion speaker, beat tag holder and proper markings which collectively would be an additional $800 to $1,000 based on what I've recently seen advertised (the speaker is EXTREMELY rare with the correct mount).
Here's my estimate of what you have although as has been mentioned previously, lust and greed set the price :
Skybolts: $200 to $300 each
Bar: $200
As a Mars collector, I would offer $500 for what you're displaying. However, given this bar's rarity and the total irrationality (one man's opinion) of the vintage lighting market, I suspect you could probably easily double this.
Good luck!