The size of the washer is M18 x 24 x 1.5mm. These are for Porsche Boxster sump plugs. 986/987 and many other porsches.
COILPACK SET for PORSCHE BOXSTER 986 987 GEN 1 BOXSTER + S SUREFIRE OE SPEC x 6
150amp NEW ALTERNATOR fits PORSCHE BOXSTER 986 987 911 GT2 GT3 TURBO 996 997
Air Con Expansion Valve fits PORSCHE BOXSTER 986, 987 2.5 2.7 2.9 3.2 3.4 AC NRF
Porsche Boxster 986 987 and others M18 x 24 x 1.5mm Sump plug washers pack of 5
Sump Plug Oil Drain With Washer For Porsche Boxster 986 987 BGA
20 BLACK WHEEL BOLTS FOR PORSCHE BOXSTER 986 987 981 718 OE STYLE ALLOY LUG NUT
