I too was amazed that the material was just too small to wrap around the pillar. Perhaps it did shrink over the years, I don't know.

Any auto upholstery shop should have equivalent new material to replace what is there, if you don't want to go to the trouble of the stitching method already mentioned.

They will also have spray contact cement made just for this purpose.

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2012 E350
2006 Callaway SC560