I have a brand new, never used, Garmin 660LM priced at $295 including shipping for sale.
Harness is included but used off my buddy’s 2016 RTL as he used a Garmin 665 on his bike. The harness is typically not included with the kit from Garmin.
All of the needed hardware is included to mount on a handle bar and I will include a LaMonster LG 1086 center mount to mount between the handlebar if desired.
Another NIB Garmin 660 was recently advertised for $375 w/o the harness and sold so this is a bargain.