Join Date: Jan 2006
Location: Memphis, TN 38133, USA, Earth, Milky Way
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OEM refers to the manufacturer - not the part. And even the manufacturer doesn't always build compatible parts the same way 20 years later, if that manufacturer is still in business, and if you can identify who the OEM was. It wasn't Ford or MotorCraft because they don't build any parts.
NOS refers to the part, but it doesn't say who built it. Ford can have 10 suppliers for 1 assembly-line (OE) part, and 40 different suppliers (over the following 20 years) for replacement parts; any of which might end up on the shelf as NOS.
But occasionally, OE & OEM parts aren't the best. Sometimes, they have a known problem that makes them a poor choice for replacement.
In any case: you can't even guess if a replacement part is needed until you know what the problem is. And that takes diagnosis. Have you looked at either switch yet?
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