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have you tried:
do you have any silicone caulking lying around the house? i would give that a try first. should hold extremely well
i wouldnt use anything of the permanent type. clear or black silicone made for glass should work well.
considering you've had the dash pad for 2 years before trying it out, and you live in Sweden, i would still try a return on that incorrect part....
you can pick up a fairly inexpensive tube bender for example:...
is this a wagon?
pics would help sell :)