Couple quick 69 L-78 questions

[Bill Rose]

1.) What color should the back impeller cover on the 065 water pump be? Natural, over sprayed orange, all orange??
2.) On the side of the 840's there is a hole for the temp sender on the left side head. The right side should be plugged. What should the plug look like? A hex, or a square hole that a socket extension would fit into? Or a square thing an open end wrench would grab?