Cannot find the right size shim for a seatpost 26.4 - 30.0mm, but can find two shims 26.4 - 27.2mm & 27.2 - 30.0mm that will do the job. Would you do it?
I'd be very leery of using two shims together. Just get a 27.2 post and use the one shim. Even better would be to use a 30.0 post and not use shims at all.
I'm loooking for 26.4 post. If its gloss black with layback and you want to sell let me know. Personally 2 shims sounds like a bodge and you'll be forever readjusting post as it will slip down.