E30 Zone

i have two brand new front jamex springs in red for my e30 bmw ... with the number 100025 written on them .. no other markings ... how can i tell what lowering springs they are ??? i.e 60mm drop or 40mm drop or 30mm ones ... this would be of great help
thanks guys

Google says they are 60mm for a Ford Escort!

60mm for a Ford Escort ????? what the hell ..... i was told for my e30 ... the rear springs that came in the set i am using .. i thought they were 40mm ....