Did you manage to have any lead?
It is very difficult to get Taqreer Ruksa Mufassal from Saudi Arabia.
I have just got mine today.
As I live in Riyadh, I booked apointment with Maroor Nasryya, when I reached there they send me to other building here and there in the last I tried to explain him I need a summary / detail of my driving license than he ask me to go to Driving School Dallah.
I visit Dallah driving school with one of my Arabic friend, at first they refuse entry but later on they allow me to enter after having some diaogue in Arabic, the same happens inside but my Arabic friend convince him and finally I got my Taqreer Ruksa (which is some arabic writing on a white papter) than we ask them to stamp and sign this paper.
Now I have to visit MoFA attestation and than Apostille.