Cab Roof Lights

[prg machine]

I am interested in putting some Clearance Lights on my K-20. I have numerous questions:

1 Is there ample clearance between the conventional, non raised, outer roof skin and the inner Cab panel for drilling holes and routing wiring?

2 Can someone post dimensions from Center of the roof, where the center light mounts, to the center of each adjacent light closest to the center light, and the distance from center, or the outside edge of the roof, to the 2 lights closest to the outside? I would also need a dimension from the front edge of Cab to the front edge of the light base.

3 How do the Pacer aftermarket lights compare to the original Yankee 77s? Are they all Plastic? I've read that most aftermarket base gaskets are cheap foam and not quality rubber like the original. They seem awfully cheaply priced to be of any quality.

4 The ones that NAPA sells are over 50.00 dollars, but look like the real thing, can't tell if the bases are Chrome metal or plastic. Anyone know about these?

Thank you!