These are strength designations for metric bolts. DSMs, being primarily Mitsubishi cars, use metric fasteners.
Metric bolt strength is designated by 2 numbers separated by a decimal. The first number is the minimum tensile ultimate strength: the resistance to fracturing, given in megaPascals (MPa). The second number is the minimum tensile yield strength: the resistance to deformation, and is rated as a percentage of the first number. Thus, a 10.8 bolt has a 10 MPa ultimate strength, and a yield strength of 0.8 (80%) of that number (= 8 MPa). Generally, the higher the better.
For a table of typical fastener grades, try here.
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