Shower cartridge replacement

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jcarhart

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I am looking for a replacement cartridge for a leaking shower. I can find no manufacture name, but an invoice from 20 years ago indicates it may be a Jolly. I can find no record of this company. I have one that almost fits.
The bonnet nut goes over the cartridge to hold everything together. My original diameter that the bonnet fits on is 38mm. The replacement cartridge measures 40mm.
The pics show what I am dealing with. The green cartridge is the too big replacement and the other one with the bonnet nut on is the origimal.
I think I need a bigger inside diameter bonnet nut or a smaller cartridge.
Any suggestions?
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