Yes the Orion 16” extension is what Andrew was mentioning. It fits into the exos2 tripod mount and also holds the mount head. I have one. As mentioned you have to open up the azimuth adjustment slot on the extension to fit over the azimuth adjustment pin on the tripod.
If you want to make it into a pier you could buy you will have to make an adapter to attach the Orion part bottom to the pier.
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired