Before Posting, Please Read Our Posting Guidelines Below.
1. Use the full 4 digit year for everything you are asking your question about. Example: 1962, 1988, 2000, 2011 2. Include the correct name of your Whaler model. Example: Montauk 17, Montauk 170, Outrage 26, Outrage 260 3. Include the length when necessary. Example: 16, 17, 18, 20, 22 4. Do not post your email address anywhere on this site as it is already in your user profile.
You could try calling one of this site's advertisers, Twin Cities Marine. Ask for Sue. Twin Cities is a Whaler dealer and is a good source of parts. It may be that some of these leaning posts are still available from Whaler.
If you can't find an OEM component, it would not be very difficult to make a custom version. The individual seats unbolt from the top of the livewell, and the leaning post just bolts on in their place. It would even be possible to improve on the OEM leaning post and create a design that better fits your wants/needs.
Along the lines of a custom approach, here is a 19 Outrage II where an RPS (reversible pilot seat) was added on top of the live-well, as well as a nice footrest:
