Im looking to lower my puma 60mm but i can only find 40mm lowering springs.
Would mk4/5 Fiesta springs fit? if not what is the best thing i could do ?

 

You cant get 60mm lowering springs for a reason. primarily that it will fuck up the damping excessively hence no demand for them since the "max power" scene has died off.

These days people who want to lower lots use proper coilovers.