Schwinn Seat Post

I bought a 20" Schwinn for my kids but it is a little to big for them.
Subsequently I want to play with it but I need a longer seat post.
The seat post is smaller in diameter than a 22mm seat post–I think it might be a 13/16. Does anyone no were I could find one preferably a 350mm. They are sold out on unicycle.com. Can I use a 22mm seat post with no problems? Does anyone no were to get a stock seat post or an extension at a reasonable price. Thanks.

I’ve got a 14" long Schwinn seat post in my big box of spare seat parts. I’ve also got two spare 9" Schwinn seat posts. It’s amazing what I collect and refuse to throw out.

I’d be willing to sell any of the posts. I no longer have a Schwinn so they’re of no use to me any more. PM me or email me if you’re interested.