[steely]

Rich,
the orientation could have been changed on both sides on some vehicles, so even if they're clean and marked and visible, someone elses' could still be 'swapped'.

Last year I replace mine, and the one remaining label fell off of the dme side - I deduced what I had, and still boo-boo'ed, but as soon as I swapped them - she started right up - and it didn't take long. Honestly, you have nothing to lose and nothing'll get hurt.