Greystorm

I have a 2013 Crew without the overhead DVD monitor. I've seen an OEM DVD that Dodge sells for about $1,500. In the description it states that they are not compatible with cars with sunroofs. Does anyone know if there is a kit available for cars with sunroofs? I've seen oem overhead DVDs from cars that have been totaled. Anyone know how easy it would be retro fit one?