There are effectively only two types. Ring anode for 120 drive pre 2005 and split anode for 130 drive. Difference is obvious. Only thing to watch for is if you have a rope cutter for which you will need a modified anode. All shown in Keyparts catalogue, but usually easily available from most chandlers or Volvo dealers. Just for completeness post 2017 drives have a slightly different split anode, but obviously does not affect you.