I've used Rox's Risers on VTX & Raider, for my applications, everything held tight even though no Knurling. Each time providing the comfort I was looking for. While they adjust at both points of contact, their adjustability can be restricted due to position limitations required to access bolts for tightening. Also Depends on clearance of surrounding equipment. I'm not sure Rox will line up right overall on the R3. I have run into conflicting information for the fitment of Rivco, I did contact Rivco and they confirmed my fitment. Due to the Rivco being tried and true, I have ordered a pair of Rivco for the Rocket Roadster. Another thread here on the forum offered info on what I found to be best buy. Phat Performance Parts have them at a discount 5% and currently allow taking a promo code for another 5% rounding off to $165.25 no tax / free shipping. I'll be interested to hear if/how the Rox's work out, most likely will still require rerouting. I'm including pics of a Raider stock photo and a set of extra 3" I have.
One other piece of info I found on the forum and commented on twice in this thread - it seems the 2005 yr has a instrument cluster that is hinged and works well with the Rivco allowing easier tank access/clearance.