Delta RP17453 Single spout tub diverter

[jpittssr]

I don't know how it can get any simpler.

1) Choice one, go to a plumbing supply and pick up a Delta RP17453, take it out of the wrapper and thread it on what you already have. Plumbers would choose this route.

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I want to thank you for this information. I doubt if I would ever found the correct replacement on my own.
I could not find the RP17453. I did find RP147569 which seems to be interchangeable. My original had the lift up knob to divert the water which is same as the Rp147569
Just discarded the new brass piece (after removing O ring) put the new o ring on my old part then screwed the new spout in place.
Nothing could be easier.