FA symbol such as, >>81-D-250 000 means what , and 81-E-000 001>>. Chevrons before the number >> and chevrons after the number >>. Do these have the same meaning as <, >, more than and less than? And if so which is which? Does any one have a repair proceedure for a loose slider on the upright of a window regulator? Thank You, Donald 84 4Ks