You can buy them separately but you will need to buy a set of coilovers to go with it.
danny here the basic measurements between the holes in cm and the length of the arms to the bolt hole for the a arms if you need any thing else let me know-
whilst waiting for the fuel system fitting and doing the wiring i decided to cut down my lip spoiler, I bought a mk golf (not gti) lip spoiler and cut 7 odd inches out of the middle, its currently drying in the garage after I glassed back in one piece...