Just installed an Apex handle into my 05 rx1 and it fits perfectly and works just like the original. I was surprised at the weight of the handle yamaha could make the whole thing out of aluminum and save half a pound of weight if they wanted too. So if anyone wants to know if the billet or standard Apex reverse handle will fit into an rx1 the answer is yes.
Indy
TY 4 Stroke God
good to know, still using JB Weld.