From what I remember, 70 - 74 are physically the same where they go through the firewall. 75 and up are bigger to accommodate more circuits. As far as a direct replacement, I don't think there is one other than the 73. In 74, they added some stuff for the seat sensors in the seat belt circuit, and it has that extra relay on the inner fender under the hood. I think 70 and 71 are the same wiring, but 72, 73, and 74 each have there own unique wiring.
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