Stefano Di Giusto was kind enough to share an exact identification for the M41 90/53 801(i) (Semovente 90/53) on pages 44 &45 of Panzerwrecks 9. We knew that it belonged to 26.Panzer-Division because of the divisional insignia on the gunshield, but did not know which unit within the division.
Stefano says: “As Daniele Guglielmi pointed out to me, the Semovente 90/53 from 26. Panzer-Division belonged to the Stabskompanie of Pz.Rgt. 26, as shown in an chart dated 1stDecember 1943.”
Thanks to Stefano and Daniele Guglielmi for making this information available.