91-92 rear crossmember problem

Does anyone know where i can find a 93+ rear crossmember for my MR2? In 91-92 models, the rear tires toe out under hard cornering. the 93+ models had this remedied by lengthening the lateral links by 98mm, and the trailing arm's attachment points were raised 3mm. If there is no crossmember out there, is there any way to correct this problem?

Thanks.: