Not much of an 1800 guy, but I believe the answer is yes.
Maybe one of the 1800 guys can confirm?
Funny how some guys answer that don't have an answer. Yes, the rims will fit. I have a 2001 spare rear off a friends trike that I use as a spare for my 2005. Many times if people want to know if something fits compare part numbers on Ronnies Goldwing Mail Order Parts web site.