We have very outdated hardware in our shower that we want to change out. The name stamped on the handle is Signature, which I believe is a Kohler product. I want to change out the trim without changing any of the plumbing. Do I need to buy a Kohler product or is there another brand that will work with the current pluming? The previous homeowner saved the installation guide which says the valve is Rite-Temp pressure balancing valve.