I've had a surprising amount of difficulty finding the answer to this question via traditional means (vendor website, store clerks, etc).
I recently moved into a house and I've been updating various things within it on my own. I'd like to replace this old Delta shower faucet handle:
with a handle of this style:
I have a feeling I need to buy more than just the new handle, but if so, what do I need to buy? A new mixer valve, perhaps?