There was a thread on here once someone was wondering what an xs would be like altered to be like a single, just found this cam on ebay which does exactly that.
http://www.ebay.co.uk/itm/YAMAHA-XS..._Accessories&hash=item19c87a4c66#ht_500wt_922
http://www.ebay.co.uk/itm/YAMAHA-XS..._Accessories&hash=item19c87a4c66#ht_500wt_922