Ok, I took a 200 lb friend and made him stand on my mystery springs, got a .75 inch deflection on the fronts and 1.5 inch for the rear. I guess that gives me about 260/130 for spring rates. They have never been on a car and came with a set of Tokico blues in a trade with a guy even older than me, from a shelf in his garage. My guess is old RB springs, those were pretty common in the day, but why all black? Anyone recognize them?

 

The ones that come with the Tokico blues...?

233/138, good guess on the rates though

 

Your probably right, I wonder if they came in black back in the day.

 

Most of the pictures I have seen they are black.