If you wanted to use the Genuine Yamaha handguards with 7/8 renthal bars you could try something like Apico handlebar end plugs which are available in 4 different sizes.
http://www.apico.co.uk/body-work-and...teel-bars.html
On my first Tenere in 2009 i fitted a set of Polisport sharps handguards approx �18 a pair.
