You can of course just replace one side but on the assumption they're originally a pair the other may not be far off needing replacement too.
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If you do both you have a more even refreshment, peace of mind, cheaper labour doing the two together
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(if you're paying) as well as saving on things like postage etc.
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If it were me I'd be doing both.
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Factory parts or uprated TRD which I believe are cheaper.
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Try Fensport or Rogue for them.
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Whilst doing
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'em check everyting else first as it's a good opportunity to replace rusty spring cups, the little rubbers that go underneath
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(for noise suppression I think) and anything else that looks or feels worn.
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R.
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PS.
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Consider getting your geometry done again after the swap.
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