How to embed the content of one post into another site

How to embed the content of one post into another site

I have two websites, and I want to embed the content of one post on one of
these sites, into a post in the other site.
I have looked at various plugins but can't find anything that works.
I can embed the entire page with this code:
<object data=http://www.pg-mysite.com/squares width="650" height="500">
<embed src=http://www.pg-mysite.com/squares width="650" height="500">
</embed></object>
But I only want the content to appear, not the headers, footers, sidebars
etc.
Is there a way to get just the post content
Thanks