This may be too esoteric a question, but the PP website is not much help. Has anyone had to install a stem extension with a PP Roman Tub? I'm ordering the 974-375 (2 of them) - do they contain both a sleeve extension and a stem extension? And will I be able to use the existing trim or am a likely to need additional parts?

(Basically - replacing the valve bodies on an old-style Catalina Roman Tub because one of them is damaged - got all the parts, except for 974-375... now ordering that)...

Thanks very much for the help.