how do i know which piston rings to buy if needing new ones, r they measured by piston diameter?

p.s im running 2.1 pinto

[Edited on 31/8/09 by omega0684]

On top of the piston it will have std /or +20 /or +40 etc etc etc mine says + 60

remember they might be 2.8 V6 pistons
(it should say 2.8 rather than 2.0)

but your still best to measure them to be sure

[Edited on 31/8/09 by mcerd1]