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I saw somewhere on the forum that the colors for position are:
orange sensor Right Rear sensor
yellow sensor Left Rear sensor
green sensor Left Front sensor
blue sensor Right Front sensor
I am not sure of the housing color difference between early and late.
89-92 I believe was the black housings
93-Up the white housings. Shape was different as well between the two however the biggest difference was the frequency was changed in order to comply with Canada standards.