Don't think the plastic rivets are available from Volvo, but on ebay there are
small plastic rivets.
The whole circlips are called starlock washers. Still available I think, part number 968039, probably about £1.50 each. You can get them on ebay much cheaper...
https://www.ebay.co.uk/itm/Starlock-...r/253723925397
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles.