PET figure 201-10 #40 fuel pump isolation rubber mount
(picture is not of actual Porsche part but similar)
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possible source: http://www.mcmaster.com/#9376k204/=4qv933
Late model bus and vanagon fuel pump mounts are a suitable replacement. PN: 113 142 355B
http://germansupply.com/home/customer/prod...cat=&page=1