This plugin adds Page Templates feature to Posts and Custom Post Types. No settings needed.

Marco Canestrari

Templatify gives the ability to select <a href="https://developer.wordpress.org/themes/template-files-section/page-template-files/page-templates/#creating-custom-page-templates-for-global-use" rel="nofollow ugc">custom templates</a> for each post type, even custom post types, as for Pages. 
Once you activate Templatify, a “Select Template” box will appear in every post edit screen filled with Pages Templates.
You can also add post type specific templates: just add “Template Post Type” header (similar to “Template Name” header for <a href="https://developer.wordpress.org/themes/template-files-section/page-template-files/page-templates/#creating-custom-page-templates-for-global-use" rel="nofollow ugc">custom templates</a>) on your custom template to see it in the dropdown selector (see Screenshots).
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<li>Author: <a href="http://www.marcocanestrari.it/" rel="nofollow ugc">Marco Canestrari</a></li>
</ul>

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