96 Grand am A/c hose replacement

My freon leaked out on 96 grand am with 3.1 engine.
Transmission fluid pipe was rubbing off against low pressure side aluminum hose going into compressor, and made a hole in it...
How big a piece of pipe do i need(couldn't see where closest connector is but it looks long going to both low and high side), and what should i worry about when replacing it(tips and tricks from experienced mechanics)
Thanks in advance
AR
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