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This should get you where you want to go brother.
They are all original design parts if there was a newer revision the 10th digit would be a "B" through "Z' and "Z" being the latest revision or newest, although sometimes this digit identifies a completely different component, even though the basic part is the same. The 1B, 1E, and 2B are variations of the original part like different color but there is no difference in their design. They all have the same date however, so they are equally new or old depending on how you want to look at it.
DIGITS #10-12 (SUFFIX)—DESIGN CHANGE:
Normally an alphabetical letter, with the original design being designated by the letter "A". A first revision to the original design would normally be noted with a "B", although sometimes this digit identifies a completely different component, even though the basic part is the same. For instance, different engine displacements and designs. Parts finished in different colors can be identified by their suffix numbers as well. For instance, the Simulated Styled Steel Wheel Covers for a 1969 Ford Thunderbird carry the basic part number C9SZ-1130D, followed by -26B for Brittany Blue color, 13D for Candyapple Red color, etc.
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