Originally Posted by
tangerineowl
You could approach this another way, using a flexier saddle perhaps. Bontrager Avarda range have a decent amount of flex throughout.
Am guessing there isn't a suspension post out there with the D-shape fit.
This.
A great and very flexible saddle is the Selle An Atomica (made in USA). Brooks started to copy it actually. I ride that on a RedShift suspension seat post and teh combination is fantastic on gravel.