if you can't figure out IKEA instructions then you should do the following:
1. walk out to garage
2. acquire hammer
3. hit yourself in the head until you are smarter.
seriously, they are cartoons that are designed for children to understand.
I have been looking for a few months for one of these as well. Color doesn't matter to me though. Good luck with your search, everything around here seems to be rusted out.
To Wagners point, i think if you dumped gasoline all over the back seat it would overpower the dog smell and it would cover it nicely. No more dog smell