My 1990 K75C sports a pair of BMW panniers which have no gaskets between lid and case. At the ascycles.com on-line fiche I find part number 18.104.22.1686.391 for one side and ~.392 for the other side at 53.47 each. At the maxbmw on-line fishe I find part number 46542300042 for both sides at 5.88 each. These prices are worlds apart, though the part numbers aren't that far apart. Am I looking at typos? Is there something else I should try?