I have a nice 48" high round Aluminum pier made to fit a G-11 head.
It was made by Astro Sky and is 6" diam., with an extra-hefty 1/2" thick wall tube ... thicker than most piers !!! A G-11 head drops nicely right into the top and it has 3 holes that mate up with the G-11. Has round base with 3 mounting holes. Painted black. Has some paint chipped off but otherwise in great shape. A simple can of Krylon glossy black paint can fix that.
I can supply pics.
I bought it for my observatory but plans have changed. I sold my G-11 mount and never used it, except to test-fit my mount on it.
$250 shipped to you in the CONUS. $190 if you pick it up yourself.