Be aware that there is a 12-30 version of the Centaur cassette not listed in the 2002 catalogue, presumably later. If you have one of those, the gold-amber “K” spacers between the loose sprockets are all the same thickness (2.6 mm) so nothing to mix up. None have ears.
If your cassette is one is one of the Centaurs in the catalogue, the spacers with ears have different thicknesses, hence different part numbers. The catalogue doesn’t make it clear how to tell them apart if they get jumbled. So from the package leaflet for mine the order is, from largest to smallest (as you would install them):
-first two riveted together as one segment
-spacer “M” is smoky grey metal with ears 3.05 mm
-spacer “N”, smoky grey metal with ears, 2.4 mm, so obviously thinner than M despite similar appearance
-spacer “O”, blue metal with ears, 2.55 mm. Has “6 - spacer - 7” engraved on it.
-next spacer is either another N (for cassettes going to 26 or 29 teeth), or a plastic “Q” spacer (for 23 or 25 max). Both types are 2.4 mm thick.
-remaining spacers are plastic Q’s.
-smallest sprocket doesn’t use a separate spacer.
All the eared spacers go with the flat face against the larger sprocket, i.e., facing toward the spokes so you are looking at the face with ridges.
If your Centaur cassette has the two largest sprockets loose, a much thinner “P” spacer 1.6 mm with ears goes between them.