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Directly from CA's Website - Driver Leather Seat Covers are expertly crafted leather seats at a great price! Made from leather that isn’t quite up to perfect restoration standards, these covers make the perfect choice for the budget-minded everyday driver! Driver Leather Seat Covers have the same leather content as those supplied originally – all leather for 1968-1969 and partially vinyl for 1970-1982.
it's likely from the hides the upholster uses. Some hide sections may have a slightly different grain, sofness/hardness/thickness, or scarring/creases. its not an issue if you drive the car alot, once broken in creases and wear will be created anyway.
It can probably also be from a missed stitch that didnt pass qc
Both seats with new skins Driver’s seat with new skins
I did mine this past summer with the 100% leather driver grade seats. They turned out really nice and I’d have to look really hard to find any imperfections in them.
I tried the leather/vinyl covers first and almost immediately tore the first one installing it. If you aren’t experienced at installing seat covers, I recommend the 100% leather ones. They’re more costly up front, but much more robust and forgiving of inexperience and lack of technical knowledge!
If you have a black or very dark interior color, there will be little to notice due to "driver leather" quality differences. Lighter colors may have more of an appearance difference.