Danny, simple way round this, you've got two choices.
1. You can drill the bars for your location dowels to secure the switchgear.
2. File the towels off the switch gear, and wrap a layer of tape round the clamp areas where the switch gear sits.
Option 1 is the 'factory' way of doing it, but unless your 100% happy with measuring, drilling and positioning everything in the right place first time, I really wouldn't recommend it.
Option 2 is the easiest, and the only adjustable way, and I'll guarantee it you won't get the bars right first time.
As for bar ends, the I/d of Renthals is 13mm, so you'll have to buy some bar ends. Just a few quid off fleabay.