The reason they break is because the anti-rattle clips are missing. Folks often discard them but they serve an important purpose, the lines will keep cracking and/or chafing without the clamps in place. No design flaw when the clamps are used but without them, #5 and #6 do seem to be the ones that fail most often, for whatever reason.
I've got a few sets for D24T but can't remember if the #5 line is different, I know #6 is -- hoping to not break up my sets anyway. Last I checked Volvo still sold new single lines pretty cheaply, and they sell the anti-rattle clamps too. Might be your best option. Alternatively you can pillage the 4-line and 2-line clamps from a junkyard VW, but the 6-line clamp near the vac pump is unique to D24. You'll want to have all of them to avoid ongoing problems.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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