Is it safe to buy an Isofix car seat base second-hand?

[MegBusset]

I know you're not supposed to use a second-hand car seat in case it's been involved in a crash, but I'm not sure if this applies to the Isofix base as well -- we are thinking of getting one for our Maxi Cosi stage 1 seat. Can anyone advise?

In many ways yes I'd imagine it is but some how I couldn't bring myself to.

i got one second hand - like new! they don't really get damaged imo

But they would in an accident and would somebody tell you if they were selling it if it had been in an accident iyswim ?