Does anyone know the size and length of screws used to affix the arm rest base to the door panel on a 69?

Just installed new screws today. NOt sure if someone stripped out the screws in my car's previous life but it now takes size #14 sheet metal screws. The shortest I could find were 1.5" length which fit fine, but I was planning on using 1" screws.

This is on a 68, but the arm rests are interchangeable so the screws are probably the same.