Tools like this will work to hold the camshaft and IS pulleys so you can loosen and tighten the retaining bolts.
FYI, if you want to change the crankshaft seal, you are going to have to pull the large bolt so you can remove the gear to gain access.
Although the camshaft and IS round tooth pulleys may bolt right, you won't be able to use the crankshaft gear unless you make some modifications to either the end of the crankshaft or to the round tooth crankshaft pulley.

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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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