MB fastener referencece guide: Life-size (1:1 scale) physical photos with MB part numbers for future searchers.

A0019940845 (PRESTOLE CAGE NUT) is image 220 in the link.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022