Do you see that thing on the end held on with one or two Allen screws? That is part of an aftermarket knob set. If you buy new knobs with that same adapter, you could put the new knobs onto the adapter. If the old knobs were OK when new, that will probably be an easy inexpensive way to go. If you are looking for another knob set, you might be removing those. Is there a brand emblem on your valve assembly?
For the new spout with diverter, the Delta pull-down spouts are nice in that they dribble a lot less than most.
Delta Faucet RP17454 Tub Spout Pull-Down Diverter, Chrome
(RP17453 is same but plastic) RP5836 similar but adapter has set screw.
There are more expensive Delta choices that have the pull-up to engage type, which is less likely to confuse visitors. See this popular thread.
https://terrylove.com/forums/index....d-cant-figure-out-how-to-turn-on-shower.7595/