Daihatsu Fourtrak F78 Coil Springs

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Hi Guys

Just want to know if anybody can give me some info on the coil springs that are availible from Milner Offroad. I am looking at lifting my Fourtrak (Rocky) to fit 31 x 10.5" tyres. According to Matthew at Milner Offroad the coil springs are the same lenght than the original coils but they are 20% stronger, which will give a slight lift at the back. Has anybody fitted these coil springs and how much did it lift the car at the back?