They sell a kit that includes everything you Will need to install the overhead light display. I believe one of the vendors on here,
www.moparonlineparts.com has the retrofit kit for the overhead console.
Here are some links to the full kits to do the swap:
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New 2010-2017 Dodge Ram 1500-3500 ADD ON OVERHEAD CONSOLE W/Map Lights,OEM Mopar | eBay
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https://www.amazon.com/dp/B01HAB3U1M/ref=cm_sw_r_cp_apa_6MwGzb6KD56AJ
Note: it looks like the add on kit is no longer available from MoparOnlinePaets website, although the Amazon link above seems to be there Amazon store with 1 left in stock.
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