[Monkey Wrench]

it would be crazy to suggest an aftermarket supplier would charge more for a "Porsch" part than another vehicle if the part is the same but you may find some of those ICV's are identical to those used by Volvo of the era. If you can ID yours and compare what it looks like to Volvo, it may bring other parts sources to light, perhaps used parts.

rubber hoses that have anything to do with recirculating crankcase smog have a shorter lifespan due to rubber rot caused by oil etc. oil makes rubber turn to mush over time.