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Harley adds the letter to a part number when the part is still basically the same part but updated. There could have been a change in a color or feature, but is still the same part. It could be as simple as a change in vendors but no change in the part. If you have a copy of an older accessory catalog, read the discription. see if there is a change in the discription.
Parts with the A after superseed the part with the same number, but no letter.
If it has a B, it superseeds the part with the A. And so on.
Same fitment, just redisigned or as said above, could be a change of vendor, or material, etc.
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