Speaker fit in '90 300E

[Number11]

I have a 300E and i was wondering what the best speakers were for my car. I want ones that fit without much cutting or modifying. I was looking into some Infinity Kappas for the front and back, as i heard they are good speakers. 52.5is for the back and 42.5i's for the front. I heard of a fellow earlier who claimed that the .5s might not fit, while the .3s fit rather well. Anyway, i just want some that fit and sound good, price isnt really an issue (i know people ). Anyway, any information and suggestions would be extreamly appreciated.

-Ged