mine was a vinyl look leather did the same thing I scrapped the old foam of and used a large tube of 3M contact cement. I used clamps like Mike and it has worked very well.
m

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)