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I've been trying to figure what pieces was used to build the vents/chimneys on the backpack of this guy:
I think the smoke is from Skaven Screaming Bell Braizers, but not sure about the vents themselves.
My initial thought was chaos tank ornaments, but I cant seem to confirm that. Please help!

There were no bits used to make those, that is the Dark Vengeance special edition Interegator-Chaplain and that is part of the model. The head is not original though, it looks to be a space marine half-bionic head from the tactical squad sprue.

Aw, bummer. Gotta be quite impossible to get hold of those then.

Any idea if there are any chaos stuff that could be used for the chimney? I'm thinking like doomsiren or similar, but cannot find any of the appropriate size.

Thanks for the help btw!

Depending on what exact look you're after you could kitbash or scratchbuild. They appear to be skulls with a very extended jaw, the smoke coming out of both the eyes and mouth. Is that what you're after? In which case a piece of plasticard tube/rod, a skull and a bit of greenstuff should be enough to make a chimney. Seeing as most skulls in 40k models come without a jaw, that shouldn't be too hard to do.

Alternatively, if you're just after a chimney stuck on a backpack, there's one dark angel veterans backpack with two candles and a sword between them, removing the sword and smoothing out the candles, and then sticking those round balls full of holes (thurible?) on them would make adequate chimneys. Alternatively instead of buying the DA backpack you can just drill/glue some plastic rods onto a regular backpack. Again, depends on what look you're after.