What is the correct name for these parts highlighted in red ?

I would call those "trailing-arm-bushes" myself, that picture looks like its fresh from Powerflex

thanks, i got pic from fiatforum

yeh mate trailing arm or axle location bushes
this on your punto ?

how easy are they to change, as mine have started squeaking, and where can i buy them, also need o/s lower arm

should all be available from barrows
bushes need to be pressed in not easy without removing axle or special tools just try wd40 on them first to make sure it is them squeeking and not another component

defo them squeaking, i tried to put wd40 on them, but there is no way to squirt it on to the rubbers

Buy a new/breaker's beam. Those bushes are not easy to get back in.

Am going to take rear arma off, and take it to garage with new bushes and get Mike Hurst to prees new ones in.