Check those fittings carefully - on the 740, the threads are extra fine - replacements are not available for the fittings.
Also note that the rack metal is softer than the fittings - a prelude to disaster - very easy to damage the threads in the rack.
I recommend that you buy two preformed tubes from Volvo or some other OEM supplier.
On my 740, I purchased a tube for the one leaking, replaced it and the other tube sprung a leak!
The second tube required removal of the first tube - when I reinstalled the first tube, I cross-threaded one of the fittings.
I contacted several GOOD hardware supply houses, the super fine thread was not available. I spent about a month on this.
Result - rebuilt rack.
Replacing the tubes are relatively easy - BE CAREFUL!
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