Dear jd620,
Hope you're well and stay so. The first device - #1389725 - is an "absorber". See: https://www.skandix.de/en/spare-parts/engine/fuel-mixture-formation/fuel-supply-system/fuellines-and-accessories/pulsation-dampener-fuel-supply-system/1048988/ .
I do not believe this part is still available from a U.S.-based Volvo dealer: it was not standard on 940s with the Bosch, two-pump system. It was used on some Volvo 740s.
As to the fuel pipe that connects filter to pump, that is #1312297. The two copper seals ("gaskets" in Volvoese) are #947621. Finally, the hollow bolt, through which fuel flows from pump to filter, is #968179. All of these should be available from a U.S.-based Volvo dealer.
Hope this helps.
Yours faithfully,
Spook
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