Check the bottom of your ramps.

That looks like it could be one of the anti skid pieces from a ramp. Many of the plastic molded ramps for sale these days have those.

__________________
Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD