I put the XV subframe connectors in my cuda. I started grinding them to fit, but it took forever. I rented a plasma cutter for 4 hours for not much money. Made the job faster and easier. It does take some time and effort to get it right, but it is worth it. No squeaks, and the car rides smoother. It just feels solid now.
If your RT/SE is a trailer queen and you show it at concours judged shows, leave it alone. If you drive it, I think it may be worth it. If the job is done right, and is welded with reasonably smooth beads, and matched to your floor paint, undercoat, primer, or whatever you have under there, I don't think it will take away from its value.