i havent found any dimensions on them.. but yes it is a very tight fit... its the Boston Acoustic S60 series 6-1/2" components. as far as i can tell all of the boston acoustics component sets come with the same mounting brackets for surface mount tweeters

for my rear speakers I have rockford fosgate slim mount 6-1/2s all I had to do was cut out the brackets for the rear and they fit barely with a 2" top mount depth, but I did have to trim the back of the speaker grilles to prevent the cones from hitting