Sorry to resurrect this old thread but i found some info worth sharing. I found the part numbers for the revised buckles instead of the old numbers im sure most dealerships try to order for replacements.

CBFT6551 Dark Grey (86)
CBBT6552 Beige (86)
CBLT6553 Light Grey (87-90)
CBA56554 Light Grey (91)
CBDS6555 Beige (87-91)
CBES6556 Blue (87-91)

Hope that helps!