has anyone fitted any speakers in the front doors?

my dad had cut the doors to fit 4" Pioneer speakers when he bought the car 20 yrs ago - now that i'm driving it I want to upgrade the system!
does anyone know if 6.5" speakers will fit? i am thinking about getting some Infinity Kappa 62.5i 6 1/2" 2-way jobbies for both front and rear... i just dont know if they fit up front. they should fit in the rear shelf no?

btw, now we're here.. has anyone ever used www.discountjungle.net ? they seem to have the best prices on the net but i am not sure if it will be possible to ship the stuff over from the US to Malta (europe) ... any advice?

thanks beforehand

Patrick