How do you tell the difference between front/rear springs

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2001 Mazda Protege ES 2.0
I just picked up a set of used MSP springs for my Protege ES. I havent done anything with them yet but how do I tell which is fronbt and which is rear?
 
I forgot but it will be obvious if your doing the install. The msp springs will lower you an inch or so and once you have the es springs out they should look proportionally similar
 
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