u should be fine steve. ukann went without a whole bolt and a ripped upper strut mount for like 4 months. but what im worried is that since your an avid autoxer it might put enough stress on those mounts to eventually crack. under normal driving i would just say go for it...but since you are putting a strut bar on those mounts they will be under alot of increased stress.

after a few autox's and after this winter...check for cracks around strut area..and save up to get the jdm upper strut mount.