I am not sure, my '71 1614 PK
had factory lights on it, but it is not a deluxe, it also has factory electric start, body tunnel and foot brakes. Other then those things, what else would they have offered that could make a deluxe model worth getting?
As for the hole in the dash, I think that is the oval that the hydraulic lines would pass through to the pump. I know we can only see part of the hole, but the flat spot at the top, and small size makes me think it is for the hydraulic lines. If that hole is for the hydraulics, then the year is probably 70-72.