Hi, if yours are old/perished & you have any signs of oil leaking/misting it will be worth replacing them. I used BP ones & the rubber part started perishing within weeks (but they don't leak like the old ones), see pic, having said that I still haven't got round to fitting my genuine ones yet. Bolts are fine to reuse just don't overtighten them as the top hat collar bites into the alloy housing.