A lot of parts are now NLA (no longer available) from Volvo so it can sometimes be more fruitful to search for VW T4 engine components seeing as it's a VAG unit...
https://www.brickwerks.co.uk/t4-part...cyl-96-on.html 
I hope the crankshaft keyway isn't damaged and the top end (valves) for that matter. It sounds as though the crank bolt/screw wasn't properly torqued up allowing the damper and sprocket to rattle loose and or someone failed to fit the diamond coated washer (see pdf).