A 2.3m mesh dish is normally used for C-band reception, not Ku-band reception, so perhaps you mean a C-band LNB?
As there are many different types of LNB's, each with their own mounting arrangements, it is not possible to answer your question with any confidence.
Look at the LNB's illustrated on an on-line satellite equipment supplier's website such as , , etc. to see if you can identify what is currently installed on your dish.
Also, not knowing where you live makes it difficult for members to recommend a local supplier.
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