u should be good to go with the type S or the 1605C. there are fakes everywhere. so try getting them from a reputed online site and they will ship it to the persons house who will bring them for u.
yes 6.5" is the standard size for both the front and rear doors.
if u wanna add the rear co-axials as well along with the front comps (since ur not adding a sub, its better u have a rear fill), try getting the same type of speakers.
eg for the type S comps get the Alpine SPS-610. same for the pioneers
theyr made on the same base and the rears will not overshadow the front components.