Jrmccrary

I have a 96 audi a4 (non bose) and i went to buy spears for it and i know the front doors are 4in but the guy told me that i could put 5.25in speakers in there and they would be good.well i pull the door panel off and look at it an i notice it has this weird 3 screw set up.also to find out the speakers he sold me wont fit.but i was asking around to other people that own b5's around me and they said they heard about a bracket you can get to put bigger speakers in,and it will also line up to the 3 screw set up.my question to you guys is where do i find a place that sells this bracket??? i need one for the back doors.i had to replace one of my doors and the car it came off of was a bose system car.and that speaker is a 3in speaker and i wanna put bigger speakers back there also.possibly 5.25 or 6 1/2's.i need help plz someone help me!!!!