... not be me anyhow...
The answer is YES - you can use a Russell seat, a Utopia backrest and
a useless unobtainium curved chrome fender rack together

...

I got this Russell seat used (thanks Bill!) and it sits me down and
back relative to my 13 yo Ultimate seat. I'm not sure if I can abide
by that, but I'm going to ride it some and I expect to find it provides
long-term comfort to the rear-end like we expect Russell seats to.
I once tried a Corbin seat for a while, it sat me down and back too,
so I sold it. If anyone thinks they want to try this seat, I might be letting it
go after a few rides for around $300... Now that I know the answer
to the $64 question I won't be afraid to get Russell to turn my
unmolested OEM seat into one that sits me where my Ultimate
sits me and maybe has some red stitching too... I like the stitching
pattern on my 1800's Russell seat a lot more than the plainer
pattern on this seat...

-Mike