No problem, I've just come across these,
http://www.motorradical.co.za/produc...egory/foot-peg
The price looks scary but 800 South African Rand is about 35 quid. I'd say the bigger platform would help your back too.
While on the subject also found these extensions by C J Designs mainly for KTM'S but also available for Pivot Pegs for those who have them fitted. Not a bad video I had to watch it a few times before I even noticed it was about footpegs
https://www.youtube.com/watch?v=X_gMdWvJnzE