hi there, wanted to see if I could get some advice with this project.
recently developed leak with 15 year old delta 1500 monitor shower faucet control, showerhead leaks continuously.

would like to replace it with newer 1700 model. delta tells me I need the rp29405 converter kit. i've never been inside a shower faucet - what exactly is coming out and being replaced? and what else do you still need to buy - a full 1700 hardware kit to go on top of this converter deal?

the escutcheon screw holes on the old model are at the bottom, 5 and 7 o'clock. will this line up with 1700 models, or does the converter kit have different screw locations to line up with newer models?

thanks for any tips or advice.