Bravo! I did a similar thing, but as I rarely have any passengers, I did this:
Simple solution for coat hook to use for dry cleaning etc
I know this may sound odd for having spent $110K on a car, and then having to "jimmy-rig" a solution to the absent coat hooks, but here it is:
It can be
easily removed when there is a rear seat passenger, and it costs 25¢ (4 for 99¢ at the "99 cent store") The "over the door" hook, as it is called, slots into the back of the middle rear seat belt mechanism.
Simple solution for coat hook to use for dry cleaning etc