Does Kohler make stem extension kits for their K 305 valve kits? I believe the combination of thicker tile installed and heavy thin set to plumb wall has mad the valve set back too deep. This would be for a T-463 Kohler shower trim, unless Kohler makes different trim depths. Original trim set was the T-461 which was mistakenly thrown out (except for handle) and have replaced with the T-463 which has a different handle which threads onto the plastic extension ring as opposed to the original handle which installs directly on the stem with a set screw.

Any input would be greatly appreciated.