As an former parts man who matched many an oil seal a close up photograph of the seal reference numbers should suffice. No need to remove if you can gain enough access.
On Metric oil seals the size is stamped on the front face of the seal. For example 20 45 6 this indicates that the internal diameter is 20mm, outside 45mm & width 6mm.
Sometimes oil seals have different lip arrangements. From memory TC double lip SC single lip. There were some numbers that doubled up as the same I cannot remember what they were.
Very rarely there may also be a 4th number which refers to the type of seal, e.g. how it is made up, steel or rubber front face or direction the lip(s) face and so on.
I've found a picture with the numbers on for reference.
As far as it being a Volvo or Renault brand seal. It would have most likely been made by a manufacturer such as NTK or Koyo or Timken anyhow. The list is endless.
A good bearing/seal supplier will assist.
Hope that helps.
Cheers
Dave
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