So I finally found a good site for schematics at Yamaha Sports Plaza
. Going through the different years I found out that the Rear Arm Suspension as it's called, had shims inside the thrust covers through 2003. Staring in '04 with the 1700 no more shims. So this chrome arm is for a 1600. I got the part numbers for the shims and thrust covers from that site and ordered them from my local shop. I was reading the article on How to Install Highway Hank swingarm covers
and decided to replace the axle adjuster thing, so I also ordered a "puller, chain" so that both will be the "push to the rear" kind.
While I'm into all of this I've been lubing everything, and cleaning things that I normally can't get to. I also found out the rear brake pads were almost gone. So I'm replacing those too.
Gonna be like a new bike when I'm done.