I didn't notice the XS Performance bit until I saw the label on the bag. First thing I did was look them up on Mike's and noticed the price was lots worse, plus there are no adjusters on his XS Performance page, just on a regular page. Don't know what to draw from that.
Anyway, the end is literally like a mirror and it's hard. Advance Auto no longer carries VW Beetle adjusters I bought before, plus one or two of them pitted some. Then I had been reading on here about some really poor VW adusters available, then I started thinking any dedicated XS adjusters are likely to be better than that no matter how cheap. So...took a leap and I think I got some good adjusters cheap.
Another thing to try -- there are VW adjusters branded "Kolb" from several sellers. Some of the ads state they're made in Germany, so might be good.