Will the 43-007 work for me

A home owner from Pelzer SC says:
My home is 12 years old, all the doors have very round handles and I have arthritis in my hands. I want to replace them all with these glass knobs. Will they fit in newer hardware? Also, is there any bulk discount? I will need 20 sets.
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Tom from SWISCO responded:

Thanks for contacting us. I'm afraid I have no idea if our 43-007 will replace your newer hardware, since I don't know what your newer hardware is to begin with. It has a 5/16" square spindle. If your old handle set uses the same, then it is possible these could work for you. I'm afraid that I cannot guarantee it, though.

I'm afraid there is no bulk pricing for this product.

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