7/8th's is a standard bar size and most bar ends should fit. They should have come with the hardware to attach them.
That being said, my stock Tuono bars are threaded on the inside, so if I want to run aftermarket bar ends, I either have to swap bars or get an adapter.
Check with your supplier, see if they sent you everything you are supposed to have.
2009 Aprilia Tuono - Ginger
2001 XR650R BRP (Big Red Pig)
2006 Honda 599 - Ex wrecked it :-D
2007 Honda CB900F (sold)
2006 Honda VTX 1300C (sold)