Your dealer couldn't be bothered then as they are most certainly still available!
Ring or email FRF Volvo in Swansea
Cam seal and aux seal use the same part so you need
X2 6842273
Crank seal X1 1276425
Cambelt 3507704
Tensioner 32298826
While you're in there I'd highly recommend changing the front crank housing gasket as the bolts are usually loose and the gasket is leaking, you will need some gasket sealant to go along the bottom of the crank housing where it meets the sump to ensure it seals again. There are some 10mm bolts holding it on and two of the sump bolts go up inside it too. Along the bottom will be the wire for the oil pressure switch, these are held on with a pair of p clips and a nut, underneath the p clips are a second nut, make sure you remove those too or it isn't coming off! It's also located on dowels and will usually need a bit of gentle prying and swearing to get it off but it's doable. Shove a rag in the hole so you don't get old gasket in the sump while scraping it off.
Front crank housing gasket has to come from Sweden so will take a couple of weeks to arrive.
Front crank housing gasket 1378493
It's best to get the genuine Volvo crank locking tool too but I don't have a part number for this, Alf on here lets people borrowed his though.
https://www.volvoforums.org.uk/showt...=319443&page=5
Post #45 shows the crank housing