I need a setback seatpost like a Thomson Elite but with a 27.0 size. I recall that RaceFace had one but I cannot seem to find any online. Does anyone have any other options for me? I don't think Thomson ever made a setback in the 27.0 diameter but I could be wrong. Thanks.

There's a few very nice setback 27.0 seatposts here; https://www.peterwhitecycles.com/seatposts.asp

Edit: unless by setback you mean "kinked", and not "with a setback clamp'...

Thanks for the link, it looks like Nitto makes one. By setback, I guess I mean a "kinked" seatpost, like this Thomson Elite. I didn't realize there was another term.

Only Thompson (and some random steel BMX crap you don't want) are kinked like that, if you need setback just get a regular setback post. The cheapest Kalloy are crap but their "Uno" model is good. There are other 27.0 posts out there but Kalloy are cheap, functional, and easy to get.

Yeah, I guess that is what I'ma do. Basically, I am trying to get a smaller frame to fit me, heh.

Thomson's are just "kinked" like that because of their head design.
They actually have less setback than most posts.
Kalloy makes setback posts in pretty much every size imaginable.