They are off a 2010 Thunderbird, the mounting bolts are 10mm so there's no need to drill the upper clamp or track down stepped bolts. Harley risers use 1/2 inch bolts,that's 12.7 mm for you metric guys. As far as them being better I can't say. They fit me well, but they may not fit you.
Don't guess at what you need. I felt the positioning out while riding, then strapped the bike to a jack, so I could sit naturally, and mimicked the position while my son measured it up. These were as close as I could get to what I wanted.
Speaking of my son he wants one of these
web page blue collar bobbers for his first street bike. Off topic I know but it occurred to me.
