The Pulsair intake into the exhaust is through holes in the cylinder head?
Exploded diagrams of the Pulsair air injection rail.

https://www.volvopartswebstore.com/products/1117876/1277457.html
It is so!
Plug #46 in exploded view illustration.

Plug is Volvo PN 1277457.
This Pulsair plug is available from Tasca (Volvo) Parts in Rhode Island, US. Versus buying from Scandix in Germany.
https://www.tascaparts.com/oem-parts/volvo-plug-1277457
There is also a gasket kit to seal the plug to the cylinder head recess. This seal is NOT part of the Pulsair air injection rail you are removing.
https://www.tascaparts.com/oem-parts/volvo-gasket-kit-271776
Plug seal is #47 in illustration and is Volvo PN 271776:

There exist the four factory installed studs and nuts to secure the keepers to secure the Pulsair air injection rail to the cylinder head. Volvo did offer a replacement stud with a different PN 953032 (different from the factory installed stud. Both studs are NLA.
Scandix sells the seals and the nuts. Hopefully Europa quality.
So you should be able to get OEM from your nearby dealership in Canada.
Congrats on exh. manifold removal! Always a tense moment!
A Volvo issued tech. service bulletin recommends new exhaust manifold OEM studs. A new bolt or tap to aid in cleaning out the cylinder head stud threaded bores. Much Kroil / Liquid Wrench and tapping to loosen. Use high temp nickel anti-seize (Permatex) on reassembly on all mating part thread interfaces.
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Jonathan Harshman Winters III: The Mightiest, Greatest, & Most Powerful North American Comedian & Comedic Actor in Perpetuity!
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