I looked into this a while ago (for taking my 3 dogs in the car on the weekends).... the dealer quoted me a rediculous price and even said it out loud that they were not confident to doing it right. There are also other small bits and pieces that they might have to order.. but could not be sure what they are exactly.

I later did some research and confirmed that they would have to take off the top liner and cut the whole.... etc.

I gave up at the end... my dogs are pretty well behave when they are in the car anyway.

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Here's the Photo Album of my (sold) X3; Album of my (newish) X5 is on the way!
(WARNING: read this before you buy anything from Umnitza)