strut cartrage problem

my brother recently wrecked my car and i am in the process of rebuilding the front end, i got a new strut cartrage from rock auto and though its for the non adjustable suspension, and i have the adjustable suspension, it wont fit. the strut is too long and the collar is smaller, but according to other sites, it will work on my car with the kyb conversion kit, which converts it to non adjustable suspension. what gives? the part number matches up and stuff, and i dont have the conversion kit, but what does the conversion kit include? any help would be greatly appreciated. thanks

Sorry, no experience that applies here, but you might try twinturbo.net, it's likely someone has run up against this problem before.