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Gas log in to existing fireplace

I'm considering purchasing a (second hand) gas log, and need a quote for this to be installed. There may be problems with the dimensions of the existing fireplace and the gas log - I don't know what the requirements here would be... Refer to attached photos for dimensions of fireplace. Note that flue = 445 wide. The log set (pictured) is 600 x 260mm. Please give indicative pricing with contact. Thanks.