Yes but you need a set of adapters (which are plastic and crap) to keep the speaker magnet away from the window regulator or can make your own out of MDF!
http://www.caraudiodirect.co.uk/vwseat-speaker-adaptors-p-517.html?cadid=jtlfjhmm4simelgrhe82rp8hs4
I have heard of people fitting 8 inch speakers in the front door locations.