I also used the Dorman Boots but that was about 6 years ago but 2 years ago one of our members had several Dorman Boots splits. Safest right now is to use the Astora Flex Boots.
The Member contacted Dorman and sent some of the split boots to them but I never followed the thread so I don't know if Dorman found some manufacturing issue or not.

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84 300D, 82 Volvo 244Gl Diesel