Couple of questions
 

1)Does anyone know if the "dome lamp switch" just means the door jam switches that turn the dome lamp on when the doors are open?

2)I am checking my pickups authenticity and would like to know if the only vin numbers are the one on the vin plate on the door jam and the one on the frame?

Thanks for any help

1) Should be the dome light jamb switch

2) Also on the glove box door, if the label is still on the inside.

You should also have a dome light switch function incorperated within your headlight switch.