I’m not sure if you have the answer to your problem or not. If I understand your initial entry correctly, you want to know how to wire your new relay when you receive it. I found this link that may be helpful.
XKE Wiring - Starter - #3 by abowie
I’m not 100% sure I understand this thread correctly as to whether this diagram is correct or not. It seems to make sense to me. In summary,
W1–white yellow
W2–black (ground)
C1–white blue
C2–it says tan but I suspect it will be brown
C4–white red
The picture that Geo Hahn posted shows the same colouring for the wires but I couldn’t read the Ws and Cs. Geo was correct, my car has an earlier relay.