I saw a pic of an '85 350X with an '86 switch. Not sure if the switch is from an R or a 200x but its the newer style colored button switch.
Can you use that switch on a 350X?
The R and X ones are available.
Also are these OEM or some knock off? 59 bucks is pretty cheap:
http://www.ebay.com/itm/L-H-Switch-H...3a4715&vxp=mtr