Is this the one you were thinking of? https://www.hometalk.com/44294519/cinder-block-fence-with-4x4-s
You can ask a question of the author on that project. They'll know the dimensions and supplies better than us. There may even be a supplies section within the post!
We have no idea what ideas are shown on the website, you could try going back to the post and clicking on it for supplies, etc or message the person who posted it.
Here is some info that may help but since I don't know what post you are referring to, I can't be sure I gave you a good answer.
If you could give us some more information/details we might be able to help.
Hi Sharon: Here is one, hope it's what you're looking for. You must make it as long or short as you want it, there is nothing written in stone (hahaha) about it :) It's a Hometalk project: https://www.hometalk.com/44294519/cinder-block-fence-with-4x4-s
Hi! Hopefully that link is what you needed. You can always search for a project in the search at the top of the page. Questions asked directly on the post will get you answers directly from the person who did the project. Good luck and stay safe!
Hi Sharon. I see that your DIY question has been answered so I won't repeat answers. Instead, I would like to share a great resource with you. If you ever want to re-visit an old project, click on the little blue house at the top of this page, left-hand corner. Boxes will drop down according to categories. If you can't find a particular project, you can use the search bar. And there's even more old projects under "Explore Projects" too. Good luck Sharon. Stay well.