I would highly advise you to stay away from John & Holger. When John & Holger owned it (about 5 years ago), they were much better.
This post is from my experience with them before i moved down to FL
sometimes you think you have it good!
Bob at John & Holger (Holger's nephew) is the one that told me that "90% of the cars that come in here have the belt tensioner shock cocked liked that. I wouldn't worry about it."
Tensioner bad?
Do yourself a favor and stay away from them. Go to Karl Heinz in Troy or Euro Autoworks on Woodward in Royal Oak.