Found good place to look for LEDs for interior Map / Dome Lights.
I recently bought and installed Blue LEDs and found them on 2 different sites.
www.NS-FX.com
www.Motoringmax.com

I found both of these web sites through EBAY MOTORS and search truck parts, interior lighting... Also narrow search down by selecting Ford F-150... Very happy with Dome Lights, still waiting on Map Lights...