Need help identifying a delta monitor shower faucet

Good morning,
Bought and moved into a new home (for me) recently and the delta monitor shower faucet has a slow drip. I see on youtube and other websites how some of these cartridges come out and I've looked at Delta's site but I can't seem to find my exact shower faucet. I know the house was built in 1996 and assume this one is of that era.
I'll attach 3 pictures of what I'm looking at and I would appreciate any help in identifying what model faucet I have. Thanks in advance. Jim

Here are 3 pictures of what I've got.

Delta 19804

2nd and 3rd have same valve body. 1st one has a longer pressure balance and front section is gray.
3rd one replaces the 2nd one. can't read the numbers. if you scour through google images similar phots of both 2nd and 3rd link to same part # Delta 19804

Thank you MR David.
Can you direct me how to get that cartridge out of my faucet?

Turn the water off to the shower valve and unscrew the large nut behind the cartridge and pull the cartridge straight out.












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Thank you. I ordered a cartridge off eBay a minute ago and will give it a try!

A lot of times you don’t have to change the cartridge, just replace the seats and springs. When you do get the cartridge make sure to replace the seats and springs!

Sorry, check that. If it is the “plug in” delta, there won’t be seats and springs in the valve body. I was thinking of the older delta. My bad.

Thanks RenewDave. I saw where I could just buy 3 o-rings but I figured for about $22 delivered that I was better off just buying a new cartridge assembly and swapping out the whole thing. I may go ahead and buy a trim kit for it also and freshen up the fixture. Over a period of time it has gotten some calcium build up and corrosion on the plated parts.

If you called Delta they would have shipped you a new cartridge free of charge.

Do make note of the "v" groove in the brass valve body, and make sure the cartridge V lines up with it as you tighten the brass ring.
It may seem obvious, but it can slip out of the V while turning the ring, so pay attention.

Thanks for the tip.