Remove the seats to do a proper job?
(Edit)
Now that I've looked at them, I stand by my earlier suggestion.
BUT, it looks like a nice solution to the "aching back" problem alot of us have. At the bottom of the page, you can order the seat covers with an inflatable Lumbar support built-in.
We need to know some things:
1) How do they look?
2) How well do they fit?
3) Which model/manufacturer did you order? MB? Chrysler?
4) Can you post some pics when you're done?
Somewhere on this site:
http://homepage.mac.com/gregmeach/XFire/
you should find a removal guide for your seats.
Let us know?????