A friend of mine wants to put on eibach springs but he is pretty cheap and found a pair of brand new eibach's for a 98 6 cyl. The part numbers are 3518.140 for the 6cyl but the fox ones are 3510.140. I just put on a set of c springs and to me they look the same but I dont know about the ride height or the performance issues he might have or if they will even fit. Anyone have any experience with this. Thanks