I have for sale one only brake pedal extender, simple bolt on - see ebay ad.
http://www.ebay.co.uk/itm/291325757362?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
http://www.ebay.co.uk/itm/291325757362?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649