Thanks for all for your replies - I know I posted this a while ago. I finally got out to the garage and re-measured for sanity's sake. Inner lengths are 40.9, 41.0, 41.2, and 40.9. Outer lengths are 42.0, 42.2, 41.9, and 41.9. All well above the 1.565" (39.75 mm) and 1.595" (40.51 mm) limits...