Just got a bad front caliper from Rock Auto. Re-man'ed by Raybestos. Threads stripped out and the bottom receiving surface was deteriorated to the extent when the line reached the end of the cut threads it wouldn't seal. Frick-snazzle-plixtor!
Of course I found this out AFTER I had already installed the right side caliper (no problems with it), it was after 6:00 PM AND it was on a Friday.

To top it off, it seems as though the replacement caliper buggered the threads on the brake hose so it needs to be replaced. Threaded the hose by hand so I know it was not cross-threaded.
It looked good in the package, although to be honest I didn't do a thorough inspection since the first one was fine. My fault on this.
So now my car sits on jack stands for at least 3 days until I can get a replacement caliper and line. Glad it's not a customer's car.
Went with Raybestos because they used to be a quality brand. Obviously not any more.