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        <link:definition>090500 - Disclosure - Sale of Receivables (Details)</link:definition>
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        <link:definition>090600 - Disclosure - Inventories (Details)</link:definition>
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        <link:definition>090700 - Disclosure - Acquired Intangible Assets, Identifiable Intangible Assets (Details)</link:definition>
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        <link:definition>090800 - Disclosure - Leases (Details)</link:definition>
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        <link:definition>090802 - Disclosure - Leases (Details) Calc 2</link:definition>
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        <link:definition>090900 - Disclosure - Credit Facilities and Long-Term Debt, Total Debt Outstanding (Details)</link:definition>
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        <link:definition>090902 - Disclosure - Credit Facilities and Long-Term Debt, Term Loan and Revolving Credit Facilities (Details)</link:definition>
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        <link:definition>090908 - Disclosure - Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details)</link:definition>
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        <link:definition>090908 - Disclosure - Credit Facilities and Long-Term Debt, Maturities of Debt (Details) Calc 2</link:definition>
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        <link:definition>091000 - Disclosure - Accumulated Other Comprehensive Income Attributable to SMP, Changes in Accumulated Other Comprehensive Income by Component (Details)</link:definition>
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        <link:definition>091002 - Disclosure - Accumulated Other Comprehensive Income Attributable to SMP, Reclassifications Out of Accumulated Other Comprehensive Income (Details)</link:definition>
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        <link:definition>091100 - Disclosure - Stock-Based Compensation Plans (Details)</link:definition>
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        <link:definition>091200 - Disclosure - Employee Benefits (Details)</link:definition>
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        <link:definition>091400 - Disclosure - Fair Value Measurements (Details)</link:definition>
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        <link:definition>091500 - Disclosure - Earnings Per Share (Details)</link:definition>
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        <link:definition>091600 - Disclosure - Industry Segments (Details)</link:definition>
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        <link:definition>091700 - Disclosure - Net Sales (Details)</link:definition>
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        <link:definition>091800 - Disclosure - Commitments and Contingencies, Asbestos and Other Litigation (Details)</link:definition>
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        <link:definition>091900 - Disclosure - Subsequent Event (Details)</link:definition>
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</xs:schema>
