Its not a post as I just built up the engine box and added a piece of foam to lean against. Have a look at:
http://rib.net/forum/showthread.php?...0&pagenumber=5
Also remember Mark Bleaker from MB Marine had a Ribtec 6.45 in the mid 90s with a normal console but S/S leaning post behind, all set at the back of the boat. Ribtec said it wouldn't work with all the weight at the back, but Mark proved them wrong and it was a quick boat at 60 mph with 200 Pro Yamaha.