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Cat Door

Hi. I have just moved into this property and the last tenant left a hole in the door and didn't replace the cat door so my property manager said I can get it replaced at my own expense. It is a conservatory door so not glass but a kind of seratone with white mdf like inner piece to it. I have a door available but not sure if will fit. I would like a microchip door but the small door is too small for my cats. Any other options would be appreciated.