Width of S3 frame struts

[Westpole]

Hi everyone, looking for some help please. I am trying to establish whether an LIS rear frame strut is out of kilter so my question is does anyone know what the width between an unmolested and undamaged two rear frame struts (outer edge to outer edge). Mine measures 41.3 cm. I can’t seem to upload a photo so my measurement was taken from underneath the frame looking directly down at the rear frame struts. Any help is greatly appreciated. Cheers.