I've never really looked at sunroof seals but door rubbers are easy to
remove and fit - you can normally just pull them off with your fingers
and thump them back on with the palm of your hand. I bet they're not
cheap though.

Are you sure your problem isn't down to the  window-frames sagging
away from the body? It's often the cause of rain-leaks and wind noise
rather than the rubbers.

If they are sagging, they can normally be straightened up with a bit
of brute force. Make sure the windows are wound down before you try it
though...

Cheers,

Colin.