Big image instead of small

How can i get the big image, and just nu the small one?

Url: https://www.heo.com/de/en/product/GSC95767

Sitemap:
{id:"sitemap code"}

The images seem to follow a naming pattern:
Small image = https://www.heomedia.com/img/nrm/d_gsc95767_b.jpg
Big image = https://www.heomedia.com/img/nrm/x_gsc95767_b.jpg

Only the /d and /x are different.

So you could probably just grab the small images urls, then use a text editor and do a straightforward search n replace /d_ to /x_