The critical measurement is the length fully extended and somewhere on the strut body should be a part number that can be referenced to give you the nominal operating force of the strut.
To swap them, need to prop the door in the fully opened position and then free each end. If the end of the strut is the type that clips onto a ball shaped anchor, there is usually a spring clip that can be prise up a little and the ball joint just pulls apart. Otherwise just unscrew each end bracket.
Auto accessory shops usually have a rack full of them.
Failing all the above, there are places that can regas them to whatever pressure you want. If there are no markings on the struts, just send them one that is working ok and they will match the specs
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Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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