I purchased some spare washers (metal gaskets) to use when changing the oil on my 2003 BF 90 Suzuki engine and they don't fit. I bought them from a Suzuki dealer. I have since checked with two other dealers and they came up with the same part number after checking the serial number. The plug does not appear to have been resized, but the washers are too small. The Suzuki website recommends checking with a dealer. Has anyone had this problem? The part number is 09168-12012.