Brake line fittings

[Red Rider]

So looking to get started on replacing the main brake line to rear of 2004 tahoe. I bought a Ni-coop 25' line but wanted to get new fittings (first time using these copper lines. The part store said they could not give me fittings since there were many possibilities.

Does anyone know what the fitting sizes are?

Second question, with Ni-coop, are there special fittings to use?

Thanks.