I have been searching various part websites for Sachs shocks and seems to difficult in finding a supplier who can supply the 2 Front and the Rear shocks all that l finding is the Front Left 313 593 and the rears 313 596 with the Front Right 313 594 not being available. What other brands are compatible with the Eibach Pro Kit . I am not interested in Bilstein B4's as the combination with the Eibach Pro Kit wasn't greatly received. What options would you recommend.