Hey i have a set of old ground control coilovers and i want to get a set of koni yellows but i've heard that i need some kind of perch adapter from ground control. Problem is that this adapter only fits the newer ground control sleeves. So is it absolutely necessary to use this adapter and is there any way i can get this adapter to work with my older style sleeves so that i don't have to go and buy a whole new set of sleeves??