IIRC there a spray-on auto upholstery adhesive we use. Works like rubber cement. Spray on both surfaces- bonds when tacky. Works well and will come apart with some careful prodding. We have used it on headliners and to refresh the "felt" on those rubber inner door seals. Any McParts should have it- Permatex, I think makes it but there's likely a 3M equal.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)