what parts do I need to buy

A landlord from California says:
hello
my name is Justin. I have the casemount where the handle came off the mount. I was planning to just change the case mount. Do I need to buy the window arms too?

Also, if i just change the case mount, can i still use the old window arms.

thank you
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of our39-429 and 39-430 Roto operators to yours. If you need to replace the hinges as well, see our 36-048. Thanks for posting! 

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