I punched it into crutchfield.com really quick and all the info. it has is the front doors are 6.5" woofers and if the car is the same as a sedan-style, the tweeters are 1"
Best bet would be to get a tape measure.. sorry couldn't be of much more help
bassminton you are kind of in unchartered waters. There was only 3,000 SportX made. Nobody on the board I know of has written this information down if they did in fact overhaul their sound system.
I would imagine all of them are pretty much the same as the sedan. The same HU is in the sedan as the SportX, so the systems will have to be fairly similar.
Fronts speakers have to be exactly the same, the rears I imagine are different speakers sizes (sedan as two speakers stacked together on the rear deck, ours are split on the c-pillar and rear firing in the cargo area), but probably ultimately the same handling capacity and resistance.
The wild card will be the sub, which the sedan does not have at all.