the 1989 mustang gt i just purchesed has some rust on the subframe on the front end. it is rusted right threw at the bottome of each strut tower, where the k member bolts up. i was thinking of just cutting it out and replaceing it with some box tube, or i have a 86 convertable that i can cut up if i have to. would rather not though. i was already planning on getting a new k member anyway, and i amgoing to have the engine out for a swap. so is the box tube the best choice or what?