I finally found a picture of it on a BT module.
http://www.spezial.cz/connectblue/apple-ipod-iphone-ipad-bluetooth-pripojeni.html
http://www.connectblue.com/products/classic-bluetooth-products/classic-bluetooth-modules/bluetooth-iphone-ios-accessory-module-obs414/
I got the first page from Bing Images and translated the first page, looked at the location on the pic, then went to the site below to get the board dimensions. From there I figured out that the size is approximately 4.2 x 4mm.