Need advice on fixing Gerber 49-300 one handle shower faucet

[TerryWhite]

Hello, my faucet has been leaking for a while now and my assumption is that it just needs a new cartridge. My problem is that I can't find any screws/plugs on it and I haven't been able to find a way to remove anything on it. I've tried searching for answers but all I can find are ways to remove ones that have screws. Any help would be much appreciated, I'll have an image attached below:

 

[Marlinman]

Your valve is Gerber 49-300 and has a Tempress 2 cartridge. Gerber has a terrible part sheet for this valve. You need to remove the chrome index button on the handle and this will expose the handle screw. This is not a standard size screw so be careful. Then you will see the escutcheon screws once the handle is removed. Search "1786-9000 Tempress ll (T2) Shower Valve Cartridge" for a factory replacement cartridge. Do not use reproductions.

http://107.0.249.92:8080/Tech_Docs/Gerber/49-300.pdf

 

[Sponsor]

 

[TerryWhite]

Your valve is Gerber 49-300 and has a Tempress 2 cartridge. Gerber has a terrible part sheet for this valve. You need to remove the chrome index button on the handle and this will expose the handle screw. This is not a standard size screw so be careful. Then you will see the escutcheon screws once the handle is removed. Search "1786-9000 Tempress ll (T2) Shower Valve Cartridge" for a factory replacement cartridge. Do not use reproductions.

http://107.0.249.92:8080/Tech_Docs/Gerber/49-300.pdf

Thank you so much! I didn't expect to get an answer so soon, I was able to remove the index button thanks to you.
One last question if you don't mind, is this the exact cartridge I need?

Barry Walter TE1990 Pressure Balancing Tub Shower Cartridge

Plumbing supplies for any project. Bathrooms, kitchens, and more. Best deals on water heaters, faucets, fixtures, lighting, and mirrors from top brands.

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[Marlinman]

Yes it is.