As Tim pointed out, the reproduction mirror (listed as the "best") when purchased will annoy you by not keeping its adjustment. Also, remote outside driver mirrors seem to have an unusual "knob" on the inside that controls the mirror. At least it was a different shape than the original in my 68. Close, yes somewhat, but certainly not exact. Another instance where it seems to have been easy to make this little knob the same shape as the original but for somereason the manufacturer chose not to.