Spare parts and upgrade advice on 13" mid 2010 Macbook Pro

Hi guys

I've just purchased a second hand mid 2010 MacBook Pro 13 inch and am after some buying advice on the best place to get the following parts:

1. Rubber feet – do these just clip in?

2. Screws for bottom of case – two screws are missing.

3. Lid/keyboard/bottom housing – there are a few dents and scratches and was wondering if there was a relatively cheap option to replace the housing or casing.

4. Do I need to upgrade the existing 4gb RAM if I'm moving to a 500gb SSD?

It would be great to get the Apple genuine specs or part numbers on the above.

Thanks.