Originally Posted by 3rdelement

the front door speakers are 5 1/4 but can fit 6/12 the door sailfins have a 1 inch tweet the ones on the corner of the dash called squakers which are useless no need to replace( only good was to fill up the stock systems inadequacies) rear are 6X9 to remove that panel you have to pop up the 3 clips holding down the lower rear seat ( do this on a warm day and after a few applications of you leather treatment or you will crack the leather for sure) remove 2 lower bolts holding the rear back of the seat in, now lift up and the 2 hooks will let you pull it out, remove the 2 rear side trim panels to be able to lift out the rear parcel shelf after now get a towel for you knees and start trying to dislodge that dam 3rd brake light it pulls out towards the front of the car, once it is removed the shelves just lifts out and you now have access

There is a mounting kit for a new radio by metra about $40 which holds any single din radio deck and has a pocket under .It is cheap and flimsy but suffices for the price of a custom bondo and fiberglass number costing about $350.
Take any part of the stock system out and you might as well replace it all, as it is tuned for itself very well , the stock speakers cannot be driven by any other amp as they will be over powered ,you can replace the whole system and keep the deck by getting line level converters ( crystal lines )they upgrade the signal and voltage to as close as an RCA as possible without one using the speaker outputs ( this is not a cheap $10 part made by pyramid they are much more and better than a basic variable resistor) as it is a powered unit

Originally Posted by lexusaudio

the speakers are 6 inch on the front , 6 by 9 rear deck. 1 1/2 tweeters door post. 3 by 5 squakers in the dash. i kid you not . they are called squakers in the service manual. the speakers are15 watts they high efficiency low watt speakers, the amp puts out around 120 amps which is around 15 watts a speaker.