Yes all 986, or 996 seats will fit your car. It will be simpler if you are replacing the the same optioned seats for similar. Example replacing seats full power with full power seats, memory seats with memory seats, or heated for heated, but probably not too difficult to adapt non matching optioned seats.
As others have mentioned look for Spec Racers who are selling off their stock interiors for good prices.
http://forums.rennlist.com/rennforums/boxster-and-boxster-s-986-forum/528321-fs-just-gutted-boxster-for-a-race-car-and-have-a-ton-of-parts-most-in-new-condition.html
Post your general location and someone local to you may have the parts you need w/o the hassle and cost of shipping.
Also lots of seats and carpet sets on eBay.
Can't help with the module, as I don't know whats involved with mating up a new or used one to to your car.
Aron