1) You don't need to lubricate the new one. The reason why there is a wire mesh
inside is to stop oil from your engine to get in the air box and at the same time to let it breeze without restriction. And yes, I would just replace with the new one, it's like $4 or so at auto store
2) You don't need that steering brace. It would help you only if you have monster tires under there, although I would just upgrade steering box in that case.
There are 3 bolts inside your driver front wheel well. Your Haynes manual has it on page 10-18 pic.16.6a. If you still don't have the manual I would just go and get one at AutoZone or any other autostore.They are like $15 or so.