Loosend,
I found exactly what you are looking for. Custom Chrome has a couple of models. I got them at a Big Dog dealer.
The stock ones also leave about a 3/4" space when tightened so I was never able to get rid of the leak.
The Custom Chromes are full circle, wider and more duable.
Check their website.
http://www.customchrome.com/catalogs/ccp/0694.htmlYou might even check your local HD dealer