Does anyone know the original primer color on ours Z's. Was it a pale yellowish-white?

Vicky

From what I have found on my 240 it was red oxide.

The inside of the rear strut tower on my is the pale yellow you mentioned.

i've found a few different colors, red, pale yellow, grey, white. not to mention the factory bondo they used to shape the car and stuff.

My 70 was dark gray, red oxide over the body filler, followed again by the gray. Color code 918. The front valance was replaced and it is the yellow color.

Jim