McMaster-Carr:
98093A652 Class 10.9 Steel Flange Head Cap Screw, M10 Thread, 1.5MM Pitch, 100MM Long, pack of 10, $10.30
98093A648 Class 10.9 Steel Flange Head Cap Screw, M10 Thread, 1.5MM Pitch, 90MM Long, pack of 10, $9.99
98093A642 Class 10.9 Steel Flange Head Cap Screw, M10 Thread, 1.5MM Pitch, 60MM Long, pack of 10, $7.92
95003A103 Zinc Plated Class 10 Steel Flange Nut, M10X1.5 Thread, 21.8MM Flange Diameter, 10MM Overall HT., Pack of 50, $8.95
91100A170 Zinc-Plated Steel Oversized Flat Washer, M10 Screw Size, 10.5MM ID, 30.0MM OD, pack of 50, $7.97
91455A450 Class 10.9 Steel Flat Washer, Corrosion-Resistant Coated, M10 Screw Size, pack of 25, $10.60
You can fix multiple cars with this list of hardware. Others may want to buy in to offset the total cost...