Juan-
I have a PRO 15&1/2" center post with donkey box and PRO gimbal. The 15&1/2" post was the original PRO center post. It's GREAT with 16mm, video, and MOS cameras. You have to extend it (usually) for 35mm sound cameras-except maybe the MOV XL and Aaton. It's my back-up post. Let me know if you're still interested.
spikesdad2@earthlink.net