How to add string to variable

Hello , i’m not a developer so please excuse me if i explain my issue in wrong way :slight_smile:
i have a WP site, and the author theme use this variable to read the image thumbnail of post

$posterimage = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), ‘single-post-thumbnail’ );
so in this case the link will be like this: https://mysite.com/2019/postthumb.jpg

so i need to do is to add “-1024x576” to the thumbnail link, since like this i can read the high resolution instaded of medium resolution
so the link must be like this: so in this case the link will be like this: https://mysite.com/2019/postthumb-1024x576.jpg

please let me know if this possible

i found a quick solution, i change the ‘single-post-thumbnail’ to ‘large’ so it read the large thumbnail

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