You should have no trouble finding both right here from our host.
I have used the MOMO Anotomico shift knobs, and like them a lot. YMMV, of course.
In terms of car covers, it depends on the use, indoor, outdoor, etc. Be sure to get one suited for your needs. I use mine indoors, and prefer the cotton flannel type. Easy on the finish while in storage, but pretty useless outdoors.