Sentence: Please analyze this, and if this fits into our current requirements,

English as a Second Language English Vocabulary, Grammar and Idioms
1

I have written this to our client (in email) - Is this correct?

“Please analyze this, and if this fits into our current requirements, use this (even with little modification).”

Best regards

2

Please analyze this, and if this fits in with our current requirements, use this (even if it needs a little modification).

3

Thanks Beeesneees for the reply!

4

Beeesneees,
‘If this fits in with our machine, use this (even if it needs a little modification).’
Is this sentence OK?
Thanks.

5

Something would not ‘fit in’ with a machine. Depending on exactly what you are speaking about, the sentence would be one of these:
If this fits our machine…
If this fits on(to) our machine…

Also the double use of ‘this’ is unnatural.
If this fits our machine, use it…