w208 replacement rear deck speaker/woofers

[petecb]

doing a bit of 'youtubing' recently and found a video of some awsom 6.5" subwoofers by sony . cant find the link but if you type in ' 6.5-inch subwoofer test video ' on youtube its the one with the yellow sub in the pic . question is , has anyone seem a similar set for sale anywhere ? the movement on them looks great and want a pair to replace my stock speakers . I dont have the bose system and wanted to beef things up abit .