The old back seat says "Made In USA" on
it. I run my bike solo, and occasionally with
an Ultimate back seat, but if I was going to
have an OEM back seat mounted to my bike
all the time, it would be the older one

...
There's (I think) a reason to run a back seat if
you use a separate backrest for the front seat:
leaning back on a separate backrest with no
back seat might bend your fender. On my solo
bike I run one of those unobtainable useless
curved fender racks and think it offers the
same protection against bending that a
rear seat does...

I tried a russell on my bike for a while, here's
a picture of it with a Utopia back rest... the Utopia mounts
to the same two front holes as a rack or a rear seat.
The bending danger occurs when you run solo without
the curved rear fender rack, or a seat, to spread the load.

-Mike