first of all congrats on ur new purchase. may it give u miles and miles of happiness
with regards to the xtreme vision bulbs, yes they are extremely safe to be used in the stock halogen housing as they are of the same wattage (60/55 W) as ur stock OSRAM Bilux. therefore, there is no need to change any wiring, no need for ANY relay. plus, they dont produce more heat as compared to the stock, tehrefore they are extremely safe to be used as they wont damage the plastic lens cover of the headlights
abt the availabilty, well to be honest i never even checked within Pakistan as somehow i dont trust the shopkeepers, may they be of any status. i wud advise and recommend that if u have some relative abroad, get it sourced from there. at least u wud be assured of 100 percent authentic stuff in ur hand
abt the fog lights, i THINK they are h11 but i m not sure. but as u already have the Depo lights, why do u want to change them anyway ? i wud say stick with them. they are good enough on their own