If your V70 hasn't got the updated waterproofing kit for the CEM the following may be helpful.
The updated waterproofing kit consists of:
30765127 Bellows
30728861 Seal
31300077 Flange Screw (4)
I paid £34.32 at my local main dealer (Riverside Hull) for these parts (March 2018).
Volvo have a service bulletin for the issue but the parts guy didn't know of it so had to speak to the master tech who, having done a few of these replacements, pointed him in the right direction to locate and then order the parts.
You will need 2 cable ties to seal the bellows.
Lukas ('spokoluzik') mentioned in my earlier post (under Traders Section see 'Problem with ETM DIM or NAVI??? Cheap services here'), has a website.
http://volvodiagnostic.com/