is there a link/page which lists in detail the dimensions of our stock front and rear speakers?

in the computer specs listing (circuit city, bestbuy, al & ed's autosound, local shops) it shows 6.5" speakers for a 02 X5 however upon examining my stock speakers i measured it and came out to only 5.5"...now i already bought 6.5" speakers so what is the true size here? i have non-dsp model

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